But wait... it says:

[I]• You can continue to carry 2 pieces of hand baggage. One bag should be a handbag/laptop sized bag which should now be no larger than 40x30x15cm.

• The size of your additional cabin bag remains unchanged and should be no larger than 56x45x25cm and can weigh up to 23kgs. Find out more about our hand baggage allowance and generous free checked baggage allowance for eligible fares here. http://www.ba.com/handbaggage

• Customers travelling in all cabins, except First and Club World will receive a yellow tag for handbag/laptop sized bags which are within the new dimensions. We guarantee that you can take this bag on board with you. Please have the tag visible for boarding and place the bag under the seat in front of you..[I]

So this means, if I have only one small bag it has to be placed under the seat in front rather than put it in the overhead bins - encroaching on my meager space in WT/ET. However, if I take a larger bag, it can be put overhead, and I have more room... . Now, where's my larger bag!

Surely, what they should really mean, is that if you have two bags, the smaller of the two goes under the seat in front, otherwise you can put your only bag in the overhead bins (?)