Thanks Carl!
I have a100k option in my sights now that has a full Lexus service history - in fact I understand that the one previous owner was Lexus itself (the car presumably used as a demo/pool/courtesy car) - odd though that its not within the used franchised network anymore. Anyway, I'm going to try Lexus directly to see if they are able to let me know about the work done (presuming that they can search their database) prior to contacting the vendors and asking about service receipts, etc.
One final question before I leave you guys alone (thanks for all the feedback so far - it's been really helpful!!), given the EG issue and the generous (but nonetheless limited) 7 year, 110k engine warranty, will anyone want to take on a 2008/9/10 plate 220d three years down the line (potential trade-in/sale time for me) - I'm just thinking on the residual value/ease of sale of a £8-£10k purchase three years down the line.
I still feel a bit uncertain about taking the plunge particularly as everything else about the 220d (6th gear and maintaining the EGR aside) seems to be perfect. The EG issue seems to be a real flaw within the diamond.
Simon