Nigel,
My spreadsheet that K7TEJ mentioned does not only address US versions
of different radios. Where I know - or expect - a modification is
needed, I have noted that. This was something Icom and Kenwood did in
the 1990s and into the early 2000s with their VHF/UHF FM mobiles and
handheld radios. Thankfully, those radios now cover at least 430-450
MHz in the 70cm band, if not the full 30 MHz band - ending the need
for that modification.
That spreadsheet is not the definitive source for lists of radios
capable of full-duplex operating. I believe there were many Standard
HTs and mobile radios that could do that, but I don't have details
on which models. There could be other radios from the traditional
amateur equipment manufacturers that are also capable of full-duplex
operation. I'm happy to add to what I already have, if I become aware
of other models that can do this.
73!
Patrick WD9EWK/VA7EWK