Gary posted this deal on his blog, offer valid until Nov 28th GMT, here is highlight of T&C
-Reductions on redemption fares across all cabins
-Available on BA Miles only (not Part Cash Part Miles or Miles for Upgrade)
-Book between 21-28th November 2008
-No travel period restrictions
-Pre-registration not required
-Offer on all routes on BA mainline scheduled services with a BA prefix, but not on services operated wholly or partly by BA’s franchisees, codeshare partners or oneworld™ alliance members.