As i said the discovery range has remained almost unchanged since 1989 to the current model. Could you swap bits from your cruiser over a decade ago. Also Landrover is an independent brand they are not owned by Rover they were set up after the war purely to build 4WD's. If your talking about after market work the ADF currently uses defenders with the td5 engine as does all the other government departments. Suspension upgrades would be for the extra equipment the ADF fills them with. Look at the after market equipment industry centred around Landcruiser and Patrol. Why would TJM, ARB etc exist if theyre so damn good. Basically if you want a 4WD then go to a 4WD manaufacturer if you want a car go to a car manufacturer. Stack an out of the box defender against anything short of a Unimog and itll whip its arse. Landrover have proven their product a million times over, some people are just sore losers it seems.
My favourite bit is that the U.S. Rangers have ditched their Humvees for landrovers AkA the SAS Long range patrol vehicles. As for dismissing the ADF links. The ADF have been using them for the past 40 years, guess that kinda says that theyre satisfied.
Cheers
Mick