My 1999 Omega Elite 24V with Sat Nav and leather was bought off ebay from a local guy in a private sale for less than £1300, I will have owned it 2 years in April and it has 84K on it. Which is 11K more than the Scorpio but 8 years younger.
I am a Vauxhall fan over Ford all day long. Other's prefer Ford over Vx, so personal choice.
If I were a ford fan and really wanted that car I would 1st go and check it out and have a spin in it with no more a £1000 in my pocket, if it ricked all the right boxes then make the bid, but at £900, at least you can go £100 more. If no deal then leave him your mobile number and walk away.
It will either sell for what he wants or he will phone you.
Also remember it is still a buyers market, Christmas and the New Year has to be paid for so car sales are slow, use it to your advantage.
All the best what ever you choose to go for.