Lovely original car but the seller wont negotiate and so it makes it an expensive car... I would also gamble that it has the usual rust issues in the flares.
That's a reasonable price for a Widebody DOHC SEC - consider it will cost 10k + to get/make a Widebody car i the first place and the engine is easily worth 10k....
It's an easy 1+1 > 2 equation for this one - but like Jay said, expect to shell out on bodywork to make pristine.
Its only from my experience, but of all the cars I have bought from around the Med over the last 20 years or so (The majority being Mercedes) they dont have the rust issues UK cars have
you should know by now that Premium bonds that arrive in the post after the 14th of each month will not even full your tank let alone buy something special!