I might have a cheeky bid
White 3 door valvers are pretty rare.
I think it was just a GTi thing as i've seen plenty of lower spec mk3's in white, red/green/blue/black seems to have been the default colour for the GTi and VR6.
My valver is grey which seems to be more commonplace on the TDI's and estates.
White was a bit poverty spec in the eighties and nineties with metallic blues, greys and blacks being the in and most expensive colours.