Dave,
The Hans Dampfs will be fine. I rode last year on dual ply Minion DHFs.
There’s more chance of pinch flats, etc riding Bennachie than the Mega course (just to give you an idea of what the course is actually like after the glacier and before the flowy single track); so the Super Gravity carcass will be fine.
I’ve still got dual ply Minions and a High Roller 2 if you want them?
Doug Marshall tried a Larsen (a super tacky one…) on the back last year but binned it (the tyre) fairly quickly.
Medical – can’t remember who you work for, but I got the BP company doctor to write me a letter (can email you the format if you like); your GP may make a small charge for writting you one.
Insurance – compulsary. You need something that will cover extreme sports and racing (and the cost of a chopper to get you off the mountain). I used Dog Tag, which is cool as you actually get a dog tag to wear…
Not sure on bike insurance. Take your new bike and it’ll be covered by warranty if you break it (as long as it’s not a crash…); I got a new front triangle for the Carbine after the front mech hanger snapped off.
Drop me a FB message if you want more info.
Rich B