Thats cool. I can see a little red BIS in your profile photo, looks nice. Bet your pleased

Now you can come to retro rides in the summer

I think as long as it has been serviced, you should drive it back.

I drove my first one back from manchester to Kent and it was a shed, it broke down 4 times and I kangarooed across the Dartford river crossing and I still made it!
With a bis, you will need to plan 3 or 4 stops to let it cool down

and the key is dont push it too hard and take your time.
Good luck!
Tom