sure, funnily enough I looked out the receipt for someone only yesterday, it's Tony Beal Ltd from Glasgow - Their website is pretty basic but I just rang them up, explained I was a photographer and was interested in white vinyl, they told me they sold a lot of it to photographers and just asked how much I wanted.
I bought mine 2 years ago for £49. I used it this week for another family photoshoot and it's still bright and clean with no damage whatsoever.
http://www.tonybeal.com/home.htm