RudderRudderRat:
During unreliable air speed whilst the crew held the wings level using constant left roll input, but with a mistaken light back pressure, it trimmed the aircraft fully nose up in response - without them realising. That's bad.
BEA:
The thrust levers were positioned in the TO/GA detent and the PF maintained nose-up inputs.
and
The PF made an input on the sidestick to the left and nose-up stops, which lasted about 30 seconds.
not sure where "light back pressure" comes from?