Originally posted by Claire L
Under current BAA restrictions no matter where you are flying to you can buy cosmetics/liquids once in the departure lounge
TSA restrictions for once you land in the US allow about 4 or 5 travel sized bottles into a quart sized zip lock bag so you should manage fine.
Claire 
VS haven't updated their hand baggage page on the website to reflect this yet, though. They are still saying that no liquids at all will be allowed onto US-bound planes. BAA (and DFT, though their guidance seems thin) are saying that you can take any liquids you have purchased in the departure lounge after security.
Someone is making an absolute fortune selling liquids in departures!
Chris