the electronics thing...
simple analogy - who has a 3.5 inch floppy drive in their PC these days? or a serial port? yet these were the ONLY mode of transferring files from machine to machine 10 or so years back... lans were rare except in the corporate world - email was limited so moving files meant moving disks...
ok now fast forward 5-10 years... who has a piece of electronic whatever that can interface with your D3/RR/TD5 and rectify any fault? chances are by then everything will be a totally different connector again? are they reliable? sort of/yes/maybe? - rectifiable in the medium to long term? I think not... now if landrover used a generic OBD port, possibly a different story.
Meanwhile my 4BD1 will idle on by rattling itself to bits over the next century or so being powered by anything remotely close to cooking oil/diesel/bio...

