Not the only Plus 4, T16 in North America.

My 1994 purchased new in Virginia and sold my sold May, 2015. It went from Maryland to Illinois.

I just cleared out some paperwork last month including Rover 800 series workshop manual I obtained in the UK.

Believe Rover 800 was front-wheel drive sedan.

I had no luck finding oil filters on this side of the Atlantic but readily available online.