Sure-fit Designs in the USA launched a UK Rep and website last year, the Rep is Jude Johnson and can be found on Sure-fit Designs UK, P.O. Box 748, Oxfordshire OX 16 6PA. If you go looking at her site Sure-fit Designs UK there is a phone number and you can e-mail her as well.
Jude stocks all the Sure-fit Designs books, DVDs, all the accessories and of course the rolls of Tracing Vellum that has been specially sourced here in the UK.
If Swisslass is coming to the UK for Easter, maybe an idea to get in touch with Jude and have this sent to an address here in the UK ready waiting for you. It comes in a cardboard tube, and the roll is 640mm x 20m at £13.95 per roll.
I believe a lot of research went into finding this particular tracing vellum so that it is equivalent to the product they use in the USA.