The maximum size of the bag must comply with Department for Transport, BAA and International Air Transport Association requirements (56cm x 45cm x 25cm). Weight restrictions will be removed but flyers must be able to lift their bag unaided into the overhead lockers of the aircraft. The briefcase, laptop computer bag or equivalent must fit under the seat in front of the passenger.

Changes to the airline's free checked-in baggage allowances will consolidate two existing policies, which are based on the number of bags or total weight and depend upon route and class of travel.
A single allowance system for checked-in baggage will be introduced from October 11, based upon a set number of bags. The number of bags that can be checked-in will vary according to the class of travel and route. The maximum weight for any checked bag will be reduced to 23kg to comply with health and safety recommendations.


Source: Airline Travel News