Whilst there, the sun came out for a while, and a Peacock butterfly was seen, along with a moth. I grabbed a quick photo, and was very pleased to identify it later as a Water Carpet - a new species for me and for Linacre (as far as I'm aware).
The other "new" species was , I think, a Short-tailed or Field Vole. The individual was found underneath an old manhole cover that was on the grass by the ringing site. I lifted it up, and spotted this.
As you can (hopefully) see, its the back end of a Vole, and appears to have a very short tail. According to The Wildlife Trust's website (see here), a Field Vole's tail is approximately 30% of its body length, so I quite happy that the id is correct. We did, also, see its face, but I didn't manage a photo of that end!! Now I know what the Kestrel that we saw, was after.