Graham, my 300Tdi was brilliant and you could fix them with a hammer and some baler twine (well almost :-) I well remember getting the TD5 and the doom mongers saying it would be a nightmare of a thing because of the electronics but I never had anything other than complete reliability.
I am toying with getting another 90 and am torn between the 300TDi, TD5 and the TDCi. I loved the TDCi because it had a brilliant heater, very un Land Rover like. It will have to be in Keswick Green however so unless I get a complete respray on a 300 it will have to be a very late TD5 or a TDCi. Decisions decisions. :-