Hello and welcome...
BJ40s are the best. I've had mine for 21 years. Did a lot of bodywork in the early years (on a thread on here) and over the years, and with knowledgeable friends, sorted the few electrical bits and pieces - 24volt and the original wiring loom.
As an ex LR and Champ owner you will appreciate reliability and a heater that works, etc but it could be long search although there are a lot more in the UK than there were a couple of decades ago. Worth looking at the usual sites in France, if you don't mind LHD.
Oz BJ40s are 12 volt but are RHD.
There's a few on here with 40s, so if you need help, just ask.
Regards,
Rodger