G-INFO is quite helpful.
It indicates that there are about 43 Hughes/Schweizer 300s currently on the 'G' reg - of which about half are the more powerful 'C' models.
But, it doesn't identify which are being operated for trainining and SFH.
To explain; a few years ago, I had a very nice S.300'C' and I was regularly being approached by people asking if it was available for trainining or rental - as they wanted to fly a Hughes/Schweizer - and specifically a 'C'.
At the time I didn't want to rent it out and, when I decided to sell, it went very quickly for exactly this usage.
However, although I went turbine, I really missed the 300 and, by chance, came across a 'barn find' (another story, but formerly G-OCJK). A year later it's back in the air, almost like new, and absolutely brilliant.
This time, I am thinking of allowing it to be used for selected training and SFH, but first wanted to check the geographical availability of other 300 'C's in the UK.