set value of radio input to be org id

also don't use nil, this isn't ruby

app/main/views/service_settings.py

@@ -276,10 +276,10 @@ def service_set_branding_and_org(service_id):
 
     form = ServiceBrandingOrg(branding_type=current_service.get('branding'))
     # dynamically create org choices, including the null option
-    form.organisation.choices = [('nil', 'None')] + get_branding_as_value_and_label(organisations)
+    form.organisation.choices = [('None', 'None')] + get_branding_as_value_and_label(organisations)
 
     if form.validate_on_submit():
-        organisation = None if form.organisation.data == 'nil' else form.organisation.data
+        organisation = None if form.organisation.data == 'None' else form.organisation.data
         service_api_client.update_service(
             service_id,
             branding=form.branding_type.data,
@@ -287,8 +287,8 @@ def service_set_branding_and_org(service_id):
         )
         return redirect(url_for('.service_settings', service_id=service_id))
 
-    # only set form.organisation.data on GET (to select correct initial radio button)
-    form.organisation.data = current_service['organisation'] or 'nil'
+    form.organisation.data = current_service['organisation'] or 'None'
+
     return render_template(
         'views/service-settings/set-branding-and-org.html',
         form=form,

app/templates/components/radios.html

@@ -44,6 +44,7 @@
             type="radio"
             name="{{ field.name }}"
             id="{{ field.name }}-{{ loop.index }}"
+            value="{{ value }}"
             {% if checked %}checked="checked"{% endif %}
           />
           {% if branding_dict.get(value, {}).get('colour') %}