Thanks for the replies.
I did have a look at the ST TDCI but you are looking at least a grand more for the same year and condition as an ST220, so their goes your fuel economy saving straight away, plus you lose the sound of the V6, they aren’t as well spec’ed, and you are potentially looking at expensive repair bills. I only do about 6k a year so a diesel really isn’t worth it.
The car I was originally after was a 330i, but after reading about the rear subframe mountings corroding and ripping holes in the boot floor, I decided against one. Also a saloon isn’t really practical for MTB’ing. After a quick google it seems the ST220 is actually quicker too, but the 330i has slightly better fuel economy.
I have read clutches are a bit weak on the 5 speed box, but I plan to go for the face lift 6 speed.
Any other problems I should be aware of?