diff --git a/app/main/views/dashboard.py b/app/main/views/dashboard.py
index 72f8f62b8..1aa5c1c37 100644
--- a/app/main/views/dashboard.py
+++ b/app/main/views/dashboard.py
@@ -418,8 +418,8 @@ def get_months_for_year(start, end, year):
 
 def get_sum_billing_units(billing_units, month=None):
     if month:
-        return sum(b['billing_units'] * b.get('rate_multiplier', 1) for b in billing_units if b['month'] == month)
-    return sum(b['billing_units'] * b.get('rate_multiplier', 1) for b in billing_units)
+        return sum(b['billing_units'] for b in billing_units if b['month'] == month)
+    return sum(b['billing_units'] for b in billing_units)
 
 
 def get_free_paid_breakdown_for_billable_units(year, free_sms_fragment_limit, billing_units):
@@ -435,8 +435,12 @@ def get_free_paid_breakdown_for_billable_units(year, free_sms_fragment_limit, bi
             free_sms_fragment_limit, cumulative, previous_cumulative,
             [billing_month for billing_month in sms_units if billing_month['month'] == month]
         )
-        letter_billing = [(x['billing_units'], x['rate'], (x['billing_units'] * x['rate']))
+        letter_billing = [(x['billing_units'], x['rate'], (x['billing_units'] * x['rate']), x['postage'])
                           for x in letter_units if x['month'] == month]
+
+        if letter_billing:
+            letter_billing.sort(key=lambda x: (x[3], x[1]))
+
         letter_total = 0
         for x in letter_billing:
             letter_total += x[2]
diff --git a/app/templates/views/usage-with-letters.html b/app/templates/views/usage-with-letters.html
index 7d26976d6..ea5e06678 100644
--- a/app/templates/views/usage-with-letters.html
+++ b/app/templates/views/usage-with-letters.html
@@ -1,4 +1,5 @@
 {% from "components/big-number.html" import big_number %}
+{% from "components/message-count-label.html" import message_count_label %}
 {% from "components/table.html" import list_table, field, hidden_field_heading, row_heading, text_field %}
 {% from "components/pill.html" import pill %}
 
@@ -100,10 +101,10 @@
               ) }}
           <ul>
               {% if month.free %}
-                <li class="tabular-numbers">{{ "{:,}".format(month.free) }} free text messages</li>
+                <li class="tabular-numbers">{{ "{:,}".format(month.free) }} free {{ message_count_label(month.free, 'sms', '') }}</li>
               {% endif %}
               {% if month.paid %}
-                <li class="tabular-numbers">{{ "{:,}".format(month.paid) }} text messages at
+                <li class="tabular-numbers">{{ "{:,}".format(month.paid) }} {{ message_count_label(month.paid, 'sms', '') }}at
                 {{- ' {:.2f}p'.format(sms_rate * 100) }}</li>
               {% endif %}
               {% if not (month.free or month.paid) %}
@@ -113,8 +114,8 @@
              <ul>
               {% for letter in month.letters%}
                 {% if letter[0] %}
-                <li class="tabular-numbers">{{ "{:,}".format(letter[0])}} letters at {{ '{:.0f}p'.format(letter[1] * 100) }}
-                </li>
+                  <li class="tabular-numbers">{{ "{:,} {}".format(letter[0], letter[3])}} class {{ message_count_label(letter[0], 'letter', '') }}at
+                  {{ '{:.0f}p'.format(letter[1] * 100) }}</li>
                 {% endif %}
               {% endfor %}
             </ul>
diff --git a/app/templates/views/usage.html b/app/templates/views/usage.html
index 85fbf32c3..f85bd07c4 100644
--- a/app/templates/views/usage.html
+++ b/app/templates/views/usage.html
@@ -1,4 +1,5 @@
 {% from "components/big-number.html" import big_number %}
+{% from "components/message-count-label.html" import message_count_label %}
 {% from "components/table.html" import list_table, field, hidden_field_heading, row_heading, text_field %}
 {% from "components/pill.html" import pill %}
 
@@ -83,10 +84,10 @@
               ) }}
               <ul>
               {% if month.free %}
-                <li class="tabular-numbers">{{ "{:,}".format(month.free) }} free text messages</li>
+                <li class="tabular-numbers">{{ "{:,}".format(month.free) }} free {{ message_count_label(month.free, 'sms', '') }}</li>
               {% endif %}
               {% if month.paid %}
-                <li class="tabular-numbers">{{ "{:,}".format(month.paid) }} text messages at
+                <li class="tabular-numbers">{{ "{:,}".format(month.paid) }} {{ message_count_label(month.free, 'sms', '') }}at
                 {{- ' {:.2f}p'.format(sms_rate * 100) }}</li>
               {% endif %}
               {% if not (month.free or month.paid) %}
@@ -113,4 +114,4 @@
       </div>
     </div>
 
-{% endblock %}
\ No newline at end of file
+{% endblock %}
diff --git a/tests/app/main/views/test_dashboard.py b/tests/app/main/views/test_dashboard.py
index 0cac648ea..862206efb 100644
--- a/tests/app/main/views/test_dashboard.py
+++ b/tests/app/main/views/test_dashboard.py
@@ -808,8 +808,35 @@ def test_usage_page_with_letters(
     assert '140 free text messages' in table
     assert '£20.30' in table
     assert '1,230 text messages at 1.65p' in table
-    assert '10 letters at 31p' in table
-    assert '5 letters at 33p' in table
+    assert '10 second class letters at 31p' in normalize_spaces(table)
+    assert '5 first class letters at 33p' in normalize_spaces(table)
+
+
+@freeze_time("2012-04-30 12:12:12")
+def test_usage_page_displays_letters_ordered_by_postage(
+    mocker,
+    logged_in_client,
+    service_one,
+    mock_get_usage,
+    mock_get_free_sms_fragment_limit
+):
+    billable_units_resp = [
+        {'month': 'April', 'notification_type': 'letter', 'rate': 0.5, 'billing_units': 1, 'postage': 'second'},
+        {'month': 'April', 'notification_type': 'letter', 'rate': 0.3, 'billing_units': 3, 'postage': 'second'},
+        {'month': 'April', 'notification_type': 'letter', 'rate': 0.5, 'billing_units': 1, 'postage': 'first'},
+    ]
+    mocker.patch('app.billing_api_client.get_billable_units_ft', return_value=billable_units_resp)
+    service_one['permissions'].append('letter')
+    response = logged_in_client.get(url_for('main.usage', service_id=SERVICE_ONE_ID))
+
+    page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
+    row_for_april = page.find('table').find('tr', class_='table-row')
+    postage_details = row_for_april.find_all('li', class_='tabular-numbers')
+
+    assert len(postage_details) == 3
+    assert normalize_spaces(postage_details[0].text) == '1 first class letter at 50p'
+    assert normalize_spaces(postage_details[1].text) == '3 second class letters at 30p'
+    assert normalize_spaces(postage_details[2].text) == '1 second class letter at 50p'
 
 
 def test_usage_page_with_year_argument(
diff --git a/tests/conftest.py b/tests/conftest.py
index 66cd2ccce..cb43e4387 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -2278,16 +2278,11 @@ def mock_get_template_statistics_for_template(mocker, service_one):
 def mock_get_usage(mocker, service_one, fake_uuid):
     def _get_usage(service_id, year=None):
         return [
-            {"international": False, "rate": 0.00, "notification_type": "email",
-             "rate_multiplier": None, "billing_units": 1000},
-            {"international": False, "rate": 0.0165, "rate_multiplier": 1,
-             "notification_type": "sms", "billing_units": 251500},
-            {"international": True, "rate": 0.0165, "rate_multiplier": 1,
-             "notification_type": "sms", "billing_units": 300},
-            {"international": True, "rate": 0.0165, "rate_multiplier": 2,
-             "notification_type": "sms", "billing_units": 150},
-            {"international": True, "rate": 0.0165, "rate_multiplier": 3,
-             "notification_type": "sms", "billing_units": 30},
+            {"notification_type": "email", "billing_units": 1000, "rate": 0.00, "letter_total": 0},
+            {"notification_type": "sms", "billing_units": 251500, "rate": 0.0165, "letter_total": 0},
+            {"notification_type": "sms", "billing_units": 300, "rate": 0.0165, "letter_total": 0},
+            {"notification_type": "sms", "billing_units": 300, "rate": 0.0165, "letter_total": 0},
+            {"notification_type": "sms", "billing_units": 90, "rate": 0.0165, "letter_total": 0}
         ]
 
     return mocker.patch(
@@ -2300,99 +2295,87 @@ def mock_get_billable_units(mocker):
         return [
             {
                 'month': 'April',
-                'international': False,
-                'rate_multiplier': 1,
                 'notification_type': 'sms',
                 'rate': 0.0165,
-                'billing_units': 249500
+                'billing_units': 249500,
+                'postage': 'none',
             },
             {
                 'month': 'April',
-                'international': True,
-                'rate_multiplier': 1,
                 'notification_type': 'sms',
                 'rate': 0.0165,
-                'billing_units': 100
+                'billing_units': 100,
+                'postage': 'none',
             },
             {
                 'month': 'April',
-                'international': True,
-                'rate_multiplier': 2,
                 'notification_type': 'sms',
                 'rate': 0.0165,
-                'billing_units': 100
+                'billing_units': 200,
+                'postage': 'none',
             },
             {
                 'month': 'April',
-                'international': True,
-                'rate_multiplier': 3,
                 'notification_type': 'sms',
                 'rate': 0.0165,
-                'billing_units': 20
+                'billing_units': 60,
+                'postage': 'none',
             },
             {
                 'month': 'March',
-                'international': False,
-                'rate_multiplier': 1,
                 'notification_type': 'sms',
                 'rate': 0.0165,
-                'billing_units': 1000
+                'billing_units': 1000,
+                'postage': 'none',
             },
             {
                 'month': 'March',
-                'international': True,
-                'rate_multiplier': 1,
                 'notification_type': 'sms',
                 'rate': 0.0165,
-                'billing_units': 100
+                'billing_units': 100,
+                'postage': 'none',
             },
             {
                 'month': 'March',
-                'international': True,
-                'rate_multiplier': 2,
                 'notification_type': 'sms',
                 'rate': 0.0165,
-                'billing_units': 50
+                'billing_units': 100,
+                'postage': 'none',
             },
             {
                 'month': 'March',
-                'international': True,
-                'rate_multiplier': 3,
                 'notification_type': 'sms',
                 'rate': 0.0165,
-                'billing_units': 10
+                'billing_units': 30,
+                'postage': 'none',
             },
             {
                 'month': 'February',
-                'international': False,
-                'rate_multiplier': 1,
                 'notification_type': 'sms',
                 'rate': 0.0165,
-                'billing_units': 1000
+                'billing_units': 1000,
+                'postage': 'none',
             },
             {
                 'month': 'February',
-                'international': True,
-                'rate_multiplier': 1,
                 'notification_type': 'sms',
                 'rate': 0.0165,
-                'billing_units': 100
+                'billing_units': 100,
+                'postage': 'none',
             },
             {
                 'month': 'February',
-                'international': False,
-                'rate_multiplier': 1,
                 'notification_type': 'letter',
                 'rate': 0.31,
-                'billing_units': 10
+                'billing_units': 10,
+                'postage': 'second',
             },
             {
                 'month': 'February',
-                'international': False,
-                'rate_multiplier': 1,
                 'notification_type': 'letter',
                 'rate': 0.33,
-                'billing_units': 5
+                'billing_units': 5,
+                'postage': 'first',
             }
         ]
 
@@ -2405,12 +2388,12 @@ def mock_get_future_usage(mocker, service_one, fake_uuid):
     def _get_usage(service_id, year=None):
         return [
             {
-                'notification_type': 'sms', 'international': False,
-                'credits': 0, 'rate_multiplier': 1, 'rate': 0.0158, 'billing_units': 0
+                'notification_type': 'sms', 'billing_units': 0,
+                'rate': 0.0158, 'letter_total': 0
             },
             {
-                'notification_type': 'email', 'international': False,
-                'credits': 0, 'rate_multiplier': 1, 'rate': 0, 'billing_units': 0
+                'notification_type': 'email', 'billing_units': 0,
+                'rate': 0.0, 'letter_total': 0
             }
         ]