This is the information on ba.com:
” British Airways is giving customers more comfort and privacy in its Club Europe cabin from February 23, 2009 by removing the use of the middle seat.
This new configuration will offer those customers booked in the airline’s shorthaul business class cabin a guaranteed window or aisle seat, with the middle seat free. It will provide them with greater privacy and enhance their ability to work and rest onboard.
Customers can enjoy a more relaxing travel experience, while maintaining the full range of onboard Club Europe services including extra legroom in a comfortable leather seat, a choice of hot and cold refreshments and a complimentary bar.
Robert Boyle, commercial director at British Airways, said: “We’ve listened to customer feedback and taken the decision to leave the middle seat unoccupied to give our customers that extra privacy and sense of personal space.”