Door window drops but immediately jumps back up

[bugman]

Thanks for the link, it was very simple tp remove the door trim after reading that.
OK having got the door latch assembly out, I found that the catch was sticking owing to the plastic coating around the latch having split.
Did my best to remove it all, but as unit is riveted together could not clean it all away from pivot pin.
Had to reassemble as no spare catch available here (mid east), problem still there.
Will have to source one from Europe or try the breakers yard.