Indeed, Sempre.
That's sort of what I was saying a while back. I would think that each soldier would have to be transferred from the British Army to the Scottish Republican Army - presumably voluntarily. Maybe resign from one and then join the other. Or, will foreign nationals find themselves booted out of the British Army as not eligible to serve as regulars?
Either way, I'm not sure anyone can just transfer entire regiments from one nation to another, lock, stock and barrel.
Perhaps Alex is expecting that the UK is going to bend over backwards to give the best possible deal in all respects and help fill in all the gaps when a very small country finds it actually can't fund pensions, forces, police, NHS, free unis, etc.