Hand baggage restrictions imposed by the UK Department for Transport after an alleged terrorist plot have been relaxed. Passengers will still only be allowed one piece of luggage but handbags cal be brought if placed inside a larger back, thus counting as one piece of hand baggage. The maximum size permitted has been increased to that of a small roller-suitcase 56cm x 45cm x 25cm (22in x 17.75in x 9.85in approx). A more enlightened view will be taken of musical instruments and other valuable items.
Laptops and other large electrical items (e.g. a large hairdryer) will still have to be removed from cabin baggage and screened separately. Restrictions remain in force regarding liquids except those essential for the flight (e.g. diabetic kit), as long as it is verified as authentic. Medicines in solid form continue to be permitted. Baby milk and liquid baby food are OK but the contents of each bottle or jar must be tasted by the accompanying passenger. However the definition of liquids includes gels, pastes, lotions, liquid/solid mixtures and the contents of pressurised containers, e.g. toothpaste, hair gel, drinks, soups, syrups, perfume, deodorant, shaving foam, aerosols, etc. Most of these items you can purchase once airside. Passengers boarding flights to the USA will be subjected to secondary search at the gate. No liquids allowed.
http://www.dft.gov.uk/stellent/groups/dft_about/documents/page/dft_about_612280.hcsp