Yes, come to think of it, when I lived in North Wales the first time around one of my housemates had a Hillman Hunter estate for a while so we had a play with the various 1595 and 1725 engine options. You could get scrapyard engines for about £30 in those days so we were able to experiment.
If I was putting a TD5 in an earlier Land Rover I'd try and get as many of the wiring looms out of the donor vehicle as possible, as well as the instruments, so it would keep the ECU happy. There are so may wires in a TD5 that unpicking them and working out which were mission-critical and which were compatible with earlier models and which you could forget about would be quite a task in itself. So the more you could just swap over the better. This guy's managed it so it is clearly not impossible
http://www.web-rover.co.uk/my.html
