Rhyming slang used to be common in the Black Country too; 'saucepan lid' for 'kid', 'blue brick' for 'nick' (gaol), guzz-gog [goose-gog, i.e. gooseberry] for 'dog'.

Other local references included 'Cannock [Chase] for 'face' (CRS: 'boat race'), and 'Pat Collins [fair]' for 'hair' (CRS: Barnett [fair]). (Pat Collins was a funfair proprietor and a big benefactor to Walsall in the first half of the 20th C.)

As you may know, it originated as a sort of working-class patois, so you could talk in front of customers without being understood.

Steve