Well, after almost 5 months, it's back
Not taken it for a long drive yet, so don't know if it handles/feels the same, but the major issues have been rectified/answered.
According to the gearbox place it was taken to, there was no issue with the gearbox, but the clutch was a bit 'grabby' so may have been causing the stiff 1st/2nd (although it seems to have gone back to normal, despite them saying they've not done anything to it); the noise from the rear is possibly due to a bearing, but they'd have to strip it to see - did notice some metal particles in the oil (had diff oil done a couple of weeks before the accident) :?
EML is off, just needed a reset, and possibly caused by battery being off
Handbrake has been adjusted and is back to its 2-3 clicks for full on
OS sill is now sitting correctly and doesn't wobble
New/correct OSF tyre fitted - but they did point out that they wouldn't normally have bothered matching a specific tyre as long as the speed/load rating of the new tyre matched (does that mean they'd be happy to put a max performance Linglong on?)
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Will also need to get a detailer onto the paintwork once I have my bumper & bonnet resprayed, as the bodyshop polishers/valeters have left the offside paintwork in almost the same, poor condition as the 100,000 mile near side paintwork. No 'betterment' there then
Just got to arrange for a new rear tyre and swap of front tyre onto my new wheels and then Mr Wilks can have my old wheels.