According to the brochure (and yes, I'm anal enough to have the right one for my car) the PF S8 weighs 1750kg unladen and the Gross Weight Limit is 2350kg.
Even worse I have a post-it note inside the brochure comparing some key dimensions to its predecessor (a Rover 800 of some sort - I had many of them!):
25% heavier (mostly V8), 6" longer, same width (over mirrors), same boot capacity, 2" more headroom and 5" more rear seat width.
(and yes I do still have some Rover 800 brochures too......
)