There are now new rules for taking liquids through UK airport security - updated 7.1.08
From 7.1.08, at 22 airports, which have now put the required facilities in place, you may take 2 (two)items of hand luggage onto your flight. This does not include all airports and you must check with your airline before departure. You can also find information on preparing for your flight at www.dft.gov.uk/transportforyou/airtravel/airportsecurity/cabinbaggage
If you are flying with Easyjet or Ryanair, you are limited to 1 (one) item of hand luggage whichever airport you are flying from.
The rules concerning liquids have not changed and remain as detailed below.
Passengers can take through airport security liquids such as toiletries including, perfume, toothpaste, deodorant, shaving foam and lip gloss, provided they are no bigger than 100 ml each.
All individual liquid items must fit comfortably into one transparent, resealable bag no larger than 1 litre or approximately 20 cm x 20 cm (about the size of a small freezer bag). The bag must fit into the one permitted piece of cabin baggage (a maximum of 56 cm x 45 cm x 25 cm) but passengers will be asked to present the bag separately when going through airport security.
Liquids of any amount can still be carried in luggage checked into the aircraft hold.