NO! NO! NO! NO! NO! Take the S8! You'll never forgive yourself after driving around there in something smaller, honestly. +++

I've been all over the NW of Scotland in my S8's (D2's not D3's but only a tiny bit smaller) and never had a problem on any of the roads.
(And that includes the infamous Wee Mad Road through Inverkirkaig) Remember, all the van drivers get through, so why wouldn't you?

And those arrow-straight single-track roads are great in a big fast mile-muncher. :snigger:

That's reassuring Andrew, as I'm planning to do this in either the S8 or the Tesla (the latter being a wee bit larger...)

Tesla bigger than S8? :Confused:

Bigger battery, at least!

Take the 8! Roads like these are more fun in an 8.

having driven it in some tight situations yes it is wider, however like you I was surprised;)

Yes, in terms of width (not length) which caught me out. It's wider than all the S8 variants, and considerably more so than a D2 and D3 - I parked mine behind an Aston Martin and was surprised to find the Tesla was wider than it.

Overall measurements (from t'internet...)
Model S - 4,978 mm L x 1,963 mm W x 1,435 mm H
Audi S8 D2 - 5,034 mm L x 1,880 mm W x 1,438 mm H
Audi S8 D3 - 5,062 mmL x 1,894 mm W x 1,444 mm H
Audi S8 D4 - 5,135 mm L x 1,949 mm W x 1,460 mm H