Where can I buy self-adhesive frosted window film, please?

I'm in London. Thanks.Where can I buy self-adhesive frosted window film, please?
Bathroom supply places, craft stores, hardware stores, department stores. You can buy self adhesive (like shelf contact paper) but exposed to the sun it would be better to get the stuff sold for window like dark tint but frosted which is applied to wet surface and a very slight film intended for sun exposure holds the plastic to the glass.Where can I buy self-adhesive frosted window film, please?
Try your local sign making shop.


They use it to cut designs out of on shop window displays.





Or try this link:


http://www.grafityp.co.uk/Vinyl/vinyl-ma鈥?/a>
Wilkinson's used to sell it some years ago but don't know whether they still do. Worth a look perhaps.
Other posters have give good suggestions. Last time I bought this stuff it was in B and Q.