I am using reverse lace appliance wheels that look similar to borranis, can take a photo if you need. We have them all over ebay US, maybe you can find a set to ship to the UK? I paid $300 for a set in mint shape.
edit, here you go
"ships to: worldwide"
http://www.ebay.com/itm/VINTAGE-APPL...lVGWZJ&vxp=mtr
I have seen 15" frequently if you're after those instead.