Really, it's only real Business until LHR.

BA has a truly horrid Club Europe: though they block the middle seat of each trio, they "enhanced" seating throughout to 30" - it you're tall, be prepared to be quite uncomfortable. 30" seems a new low for "short" haul business (not so short when it's the LHR-ATH and IST-LHR I experienced last year).

I'd suck it up and get the best seat available in "why" and keep looking for that 'SAAver seat - call again closer to departure if you're seeing significant seat availability.