Excellent habitat due to good fencing.
This (above) is what happens if you don't check your rafts regularly enough. I usually go down every 7-14 days - the more often you can look, the better - but with being on holiday I missed a week. The result's a confusion of prints that aren't really readable, though I think I can see some water vole and some brown rat in there.
Plenty of water vole feeding going on all along the top section; less lower down, towards the marina, but no sign at all of any mink.
Then, on the way back home I stopped by the stream just before Dobson's Bridge, and saw a vole pretty much straight away. The farmer who owns the field by this brook has helpfully set his fence well back so there's a good margin of unpoached, untouched bank, and it looks to me like a place that's teeming with wildlife.