Sorry, I don't have a link, but here were the T&Cs:

Terms and Conditions

Promotion applies to certain published return and corporate negotiated net fare return flights in First (F, A) and Club World (J, C, D), on services operated by British Airways Plc only.

It does not include flights operated by any franchisees, code share partners or oneworld Alliance members. Tickets must be booked, purchased and ticketed in the UK or Republic of Ireland only, for travel between 9 November 2010 and 15 December 2010 inclusive and all travel must start and finish in the UK.

Pre-registration is required. Only the first four flights made by the Executive Club member will qualify for this promotion. Terms and conditions apply, please click here.

PS you might have had a faster response has your title been more descriptive!