Was your car also unlocked? I have on occasions used the key to lock my doors when the windows have been down and they shut automatically. If I then use the key fob they windows will shoot down to there old position.

pedal trick is only for engine related faults you will need a code read for the central locking ecu or better still a vehicle wide dtc check only available with tech 2 i believe (there are soooo many ecu's on these and checking in the right one maybe a hit an miss afair unless you use someone who knows vauxhalls), Regards TB