Canadian Chevy Suburban seen a few years ago in Wiltshire, used to drive about a lot in the Warminster/Westbury area for 3 months and disappear again for 3 months before appearing again, always a female driver with about 4 kids in it, there is obviously a large military presence there but not for US/Can personnel.
Kazakh numberplate on a massive 4x4 vehicle that looks like a cross between a Humvee and a Tank, sometimes seen in Newcastle and South Tyneside
Also see the odd Japanese plated car in the North East but then it is usually seen along with the obligatory trade plates in the front and rear windows as some of them come in as imports to the Port of Tyne and then go to dealers to be converted and registered here.