I posted the other day with a question about my HW cylinder - decision was to get a new one. A quick survey of the market over the past couple of days shows B&Q price =A3238; Screwfix price =A3145; local plumbers merchant - =A3135. All exactly the same cylinder/manufacturer.
I thought there'd be a difference but....... blimey!
Moral of the story is never to go a shed if there's a real shop open....