I hadn't had a sighting at WLM since I saw the rat, and wondered whether the voles had been forced upstream or if they were just staying below in their burrows out of the way. I did immediately call in Shropshire Council's brilliant pest controller, a man who knows his rats from his voles and can remove the former without harming the latter, so I knew if the voles hung on they'd be OK. Then I went this evening and saw two very fresh latrines, so hooray. There's also a bit of feeding in the third photo down.
Couldn't resist also including these two snaps of my friends' garden hedgehog. They're a bit more picturesque than the eternal pics of poo.