Punning chip shop

Codsall's fish & chip shop is like a lot of chip shops: it can't resist a pun. As it says in its slogan, it "puts the cod in Codsall". Ho ho. At least it creates a smile in Codsall, which, despite being the 'capital' of the South Staffordshire council area, has a pretty dull town centre.

Somewhere in Stoke (is it Bucknall?) there is also The Codfather (!), there is 'Codswallop' in Forsbrook and almost too many others to mention.
Hairdressers also have the same tendency to pun.

(But no other types of shop, which I don't quite understand... Why just these two types?)