After doing (a lot!) more research, I've seen these units fitted to post-facelift Discovery's. Would there be any difference to the steering wheel audio controls (wiring, etc) between the early & later TD5's, does anyone know?

Firstly, 'Hello' folks :) Just had to sell my lovely Puma 90 (extra dosh needed for a house move), and have just gotten a 1999 Disco TD5 ES auto. Very lovely, except for the dreadful aftermarket stereo someone's fitted. I'm not fussed about big booming systems, etc, but do like the radio & CD...