Add British Library domain

app/domains.yml

@@ -249,6 +249,12 @@ ukexportfinance.gov.uk:
   crown: true
   agreement_signed: false
   
+# Other non-crown
+bl.uk:
+  owner: British Library
+  crown: false
+  agreement_signed: false
+  
 # Local Government
 aberdeencityandshire-sdpa.gov.uk:
   owner: Aberdeen City Council