Yours does sound a bit big to be moving. I have one in a large pot outside the back door but it is kept fairly small (3 - 4 feet tall) by pruning for use and has so far proved hardy in East Anglia. At that size, I think I would leave yours where it is and invest in a new one when you get settled in Scotland. I don't think they're particularly tender, but they do suffer from cold winds so the leaves drop.