Lots of different Princesses. Upright limo shaped thingy - I think a 4 litre very unsophisticated inline 6 (but P100 or similar headlights), then one like that with faired in headlights, then the 3 litre Vanden Plas Princess (similar to the Austin Westminster - which was an almost unknown car in the USA) then the Vanden Plas 4-litre R which used an only slightly demilitarised version of the Austin Champ engine, then the one I reckon you mean, Bobster, the wedge shaped one with variously the 1800 B series engine transversely, the O series 1700 engine transversely and the 2200 6-potter transversely. Of the latter the auto was not too bad but the manual was a tyre-squeal special and the uneven length front propshafts tended to mangle the box/diff/each other/UJs if driven by leadfooted oafs like me!