I don't mind a difficult challenge, but this is unfairly obscure. I have literally never in my life heard of two of the items in the 'Limerick' group, and the 'Norwich' group hinges on a link that only a small group of enthusiasts could be expected to know. Unearthing deeply obscure terms is not the same as ingenuity.

liked this again a nice mix

Enjoyed this. Got the Bristol group quickly. Eventually spotted the Norwich and Carlisle groups, but couldn't get the connection for the fourth group.