Not sure as you'll top 50mpg unless on a journey but BMW 320d would be a good choice, though at that budget factor in a couple of hundred quid to get the swirl flaps removed, lovely drive to boot.
There's bigger engined models too, if you want to trade lower mpg for a larger cruiser.
MB would be considerable too, except their quality went west, whether it's back now the jury is still out on.
PSA auto Diesels, 406/7, 607 and C5.
Volvo S60/80.
Vectra/Saab 93, Mondeo.
Audi auto's don't seem to live forever but others may know different.
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