Thanks, I never knew it was air street.
As for OP, be careful what protein you buy. Casein is slow releasing and has a good profile of amino acids. Whey has a full profile of amino acids but is processed very quickly by the body, usually prefered for bodybuilders and sportspeople. Other sources...
Hey, there's a shop called 'bodybuilders of Brighton' in Brighton which sells powder from MyProtein.com. The prices are very similar to online (a few pounds more) so I recommend it. It's in the cut through which takes you from churchill square to queens road (I dunno the name).