Anyone know a place or two in the UK that sells those?

Do they do that size?? They only seem to have 15 x 8 on this site???

Rota RB at POTN.com

same here...

another supplier

There's a third supplier stating that the 13x8 size is the only one available with 15's coming shortly - maybe thats out of date.

http://rarerims.co.uk/alloys.php

Rota rims are nice and lightweight. Think they are made in Malaysia or somewhere, not sure if that effects quality. I considered them before going with OZ Ultraleggera