If you can live with some of the cosmetic imperfections then it would be worth a look. I think the seller mentioned the springs had been replaced but as has been said, depends on the quality of the part. The car may appear to be top price but the 400's are getting rarer and knowing how good these cars are, I think worth the money.
My only concern is the SORN - why MOT and then SORN? Still might be worth a punt.
Let us know if you go and see it.
Took mine for a spin yesterday - what a car! Picked up my son's friend, he got in and said, "This is a luxury car!" That boy will go far!