The 3 class tripple 7 was also on the BHX route in April. The seats were not selectable when i booked the flight. But during OLCI they were. I waited for the OLCI to open 24 hours before the flight and grabbed a first class seat!!

Only problem was due to load factors in Economy it was switched back to a 2 class on the morning of the flight!! Still much better than the Airbus though.