Certainly seems to give some sort of discount, I haven't found dates yet that it hasn't worked in some fashion.

As I mentioned in a pm to the mods:



LHR-SYD-LHR 21st to 28th Nov in Y. BA price £923, FC price £877

LHR-JFK-LHR 5th to 12 Dec in F. Ba price £3808, FC price £3476

Also checked lgw-Jer-lgw in club which was about £222 without and £205 with (from memory)

A last minute Y fare to LAS costing about £1091 came in about £70 cheaper.

I didn't check them all, but booking class appeared to stay the same.

On the flight selection screen "discounted" comes up in red above the price.

Will check more later, can do some random checks if people want too if there's something I haven't thought of trying.