G-INFO suggests 51 T-61s of all marks (I may have miscounted by one or two) and 54 Scheibe SF-25s again of all marks. How many are airworthy is anybody's guess.
I noticed from the Saltby photo that G-BUNB from Odiham and G-BTWE which flew into Popham in September weren't there, so that's two more that are airworthy.
If only they were more comfortable. BUNB curls my back and is literally a PITA