Things have been so quiet for about 18 months, looks like time for problems again!
Today I had the the drivers door window open. I parked up went to close it and when it was half way up, back down it went! It did this several times, half way up and then straight back down. Eventually I put my hands against it and helped force it up past the "sticking point" - it went up and once closed I turned off the ignition.
It's been OK since. Once I got home and put it in the garage I tried it over a dozen times and no problems. Is this a sign of things to come, does anyone know?