In what sense?
If you mean the red windcheater as per Rebel without, your best bet is to try MERC on Carnaby Street (they do mail order and have a website) - you are probably best getting one of their own brand Harringtons, which is damn near identical but with a tartan lining.
Other than that go onto timeless24.com which is a rockabilly clothing specialist and one of the few willing to post to the UK.
Yours,
Little Bastard