I just came across this blog at http://blog.hopwise.com

The author is compiling a list of many interesting premium deals on a number of airlines, including BA.

To keep this slightly on topic, the latest BA deal is if you fly from Turkey, you can upgrade one of the legs to F, providing you are buing a J, C or D fare. Or if you buy a WT+, they'll upgrade you to CE on the shorthaul segments.