It is £460
It's your choice and I don't want to cast a spell, but personally I would still walk away. I just don't get the vibe he's taken good care of the car and hasn't maintained it with the same live you and I would give. I could be talking complete crap and the car is superb. But you know when you just get that gut feeling.
If you are really interested as I can see you still have something for that car. Why not ask for 6 months road tax and I'll take it for £11k - final offer.
You can see he wants rid of the car, so he may be tempted?