We have one for Macro here in Londres, biggest warehouse I've seen and its on 2 floors with escalators you can use trolleys on going between the levels. Good if you have a party coming up, and they sell lots of cool alcohol you can't otherwise buy. They also sell bags of say 25 random, mixed beer bottles for a fiver or so. Sell electrical goods wich can be super cheap as well, as they buy thousands of them and are able to store them and sell them for pennies. Good shit, worth a wander round just looking at the random things they sell.