2007 E320 CDI Pre purchase checks?

Because of distance, it's unlikely that I'll ever return to the dealer if there's a problem, so I just wanted to ask if there's anything specific I should be checking out?
I have the VIN number and have carried out an HPI check - it's on 125,000 miles. As I've never driven this model before (I've had two previous W210 estates, including the E55!) I wondered what to expect?
Any tips or advice appreciated!
He had even arranged finance for me for that specific vehicle and had refused a deposit saying there was no need as I clearly was committed, but then did the dirty...
Ended up buying a cheap Jaguar X Type estate as a stop gap, but will probably go for a later R Class at some point soonish.


