p3eps says ""Cars with leather generally sell for approximately £1000 more than without according to the VW Used website... "
When my ED30 was written off (yawn...) I had to spend some time trying to find similar specced cars to compare for insurance purposes. When I was looking at GTI's, the VW Used site seemed to give approximately £1000 for a car with leather over one with cloth.
Like I said in the thread you're quoting - I haggled mine for £1300.
If it wasn't for the Golf R having white bolsters on the seats I wouldn't bother as I think leather in general (whether its full leather and great quality, of part leather etc) is a waste of money. It does look nice, but its a pain in the butt as its either roasting hot or freezing cold!
For me the half and half seats in the ED30 were the ideal solution. The leather bolsters give great support, but the cloth centers mean the heated seats work great and that you're never roasting or freezing!