British Airways generally allows passengers to bring one piece of carry-on baggage on board, as well as a smaller accessory item. The main carry-on bag must not exceed the dimensions of 56 cm x 45 cm x 25 cm, including any wheels or handles. The smaller accessory item could be a handbag, laptop bag, or similar, and it should fit under the seat in front of you.
It is also important to note that there are specific allowances for different ticket types, such as World Traveller and Club World, so it is wise to check the specifics related to the fare class. British Airways also has guidelines concerning restricted items that cannot be taken in hand luggage, such as sharp objects or liquids over a certain volume. For the most accurate and detailed information, including any updates or changes to policies, it is advisable to consult the relevant section on the British Airways website.