Thanks for that Pelle.
Right...last night i checked it out...gave the door catch a good squirt with GT85...didnt work.
tried a window reset...didnt work - window (up) stopped at the 1/2" open position.
took the door card off and inspected the microswitch...was slightly dusty/dirty on the outside, looked at the 2 connector pins but they looked fine - the window dropped slightly when i disconnected the switch...then went back to position when i reconnected.
Checked the wires werent frayed etc etc everythig ok - microswitch was in its cradle also.
Didnt remove the door lock but couldnt see anything untoward...
Put the door card on, shut the door and still the window goes up to seal and then drops to the 1/2" open position.
........
so ive admitted defeat... handing it over to my auto-sparky later this week.
I now think its nothing to do with the lock mechanism...and believe its a relay.
which could be costly...