I had a feeling this promo would be coming seeing as BA have done it for the last 2 years now. Anyway I snagged some flights to YYC to see my friend and to sample the Canadian winter. Compared to everyone else I didn't get that great of a deal (£1250 LHR-YYC then YYC-SEA on Alaska and finally SEA-LHR) but still it's a pretty good deal bearing in mind a WT+ seat on the outbound flight was £250 more!