I had saved this topic because both my windows had given up the ghost around January. I've barely used the car since but nearly died yesterday with the heat so today was the day to go into attack mode..
Pleased to report that simply swapping the driver's complete motor from my 2006 donor car has cured the problem.
During one of several tea breaks, I came across this video on a 2007 polo where the chap swaps out 2 items from the motors circuit board and fixes his windows. He names the part numbers of items, which is double Dutch to me (no circuit boards when I started off with my 100E pop) but hopefully will be of help to some on the forum after a trip to Maplins or the like.
Apologies if my advancing age means I'm barking up the wrong tree.