Thanks for that Grippa. I'd already ordered a new tyre so I thought I should get them to fit it anyway.
BUT I also asked them to have a look at the removed tyre and see if repair was possible...
It was! So, for £6 I now have a spare spare with a lot of miles left!
[Thanks to all at Bracknell Tyre & Battery for being helpful
(although I think the fitter thought I woz muckin' 'em about too much!)]