Now sorted!
Spoke to Scotthall BMW Service dept who advised me the anti-trap needed resetting. I started with the window in the down position and moved the window to the closed position but stopping three times on the way up. I then kept the button held for 5 seconds when it was fully closed. I then opened all the way down again, followed by all the way up (in auto mode). The anti-trap has now been reset and all works ok.
