We've found parts on Ebay and there was also an online breaking yard that we managed to get (I think) a window winder from. I remember coming across websites where you gave details of what you are looking for and they try and source them for you. Also we have a breaking yard nearby that has mainly commercial vehicles and I think we found something there too.
If you put Renault master breaking for spares in search on ebay brings up quite a few been broken for spares. Just found out my old supplier of parts for my Renault has closed down :-(
cheers Rowan, waiting for them to get back to me. tried the other place you used to use that you posted on the other thread and they shut down a couple of years ago unfortunately