I've been driving around the roads on the Hell on the Ashdown and the Kentish Killer this weekend. Lots of bikers out practicing. They are some SERIOUS hills in places
I wouldn't strip it with a grinder. You'll tear into the metal woo much and it'll make a mess of it. The best way is Nitromores and a wire brush; but I'll warn you, it's a horrible job. For frame refinishing, I know Bob Jackson's refinish frames. Thre's also a place called (I think) Argos up North somewhere that also do frames. A lot of folkies on RB don't like powdercoating frames. Not entirely sure why, but it's probably because the finish isn't as good as getting it sprayed and it's difficult to touch it up. You can get all the decal sets. I think your best bet would be to sign up over on Retro Bike. I'll post your question up for you and see what it brings back...
http://www.retrobike.co.uk/forum/viewtopic.php?p=1376306
Argos is in Bristol. top bunch of guys, but very pricey




