I did a post on Facebook about this the other week. In the UK we have:

MT818 (T.8 prototype – not flown yet)
MJ627
ML407
PT462
PV202
SM520

In Germany: MJ772.

In the US: TE308 (undergoing rebuild).

In New Zealand: MH367.

In the UK there are at least two/three Tr.9 projects on the go. There is another in Australia.

If you want to be pedantic, you can include ML417 in the list, since that was restored back to a single-seater in the 1980s…!