NOT QUITE WEST YORKSHIRE..but close :party: I found a Guy in Rotherham who sells 6 KG Cylinders complete with CO2 for £30! He used to trade as Firelec..but now he's trading as Safron Safety.
He never used to charge for the cylinders but..now he gets charged so he has to pass it on..HOWEVER...once you buy the full Cylinder each refill is £12!!
His name is Mark and he's at Unit 11, Bolton Road, Manvers, Rotherham S63 7JY. His Mob is 07535265482. Give him a call before you go..and he will organise to meet you at his Unit!! (mention Homebrew Forum)
He says he may be able to refill your current Cylinder...BUT...You need to speak to him first to discuss the type etc..