Thanks. Finn Air said it wasn't a published fare so were unable to help.
I'm skeptical though as Expedia said '2 left at this price' and on the same plane, AY also said '2 left at this price'
Would there be any mileage at all in calling BA to match the price?
Also, it may sound obvious, but if I'm travelling at 0845 on 30/11 and it's a 28 day pre purchase fare, can I buy the flight anytime on 2nd November or must I have it done and dusted by 0845?