Yeah, your not alone mate.
B & Q used to do their own brand stuff, was a nice yellowy colour too.
They stopped doing it apparently and now only do some other brand, the colour is really grey, and when you drop it on the blocks, its coats them with dust. Rubbish. And its not cheap either.
Try jewsons.. Or TP do some good stuff, but TP up here are few and far between.
Wickes stuff is the greyish colour too but is nowhere near as dusty as the new b&q stuff.
Trial an error, but the prices are pretty much the same wherever you go, unless you can store a pallet load of the stuff?