I started at the top of the site today, and had a quick check of some of the tit nestboxes. As predicted at the weekend, there was no sign of any nests yet, but I did manage to see a couple of Brown Hares (in the woods, not in the boxes!), and these 2 little critters; Brown Long-eared Bats, I believe.
Brown Long-eared Bat
With the weather so nice, I spent half an hour at the bottom of the top reservoir, where there was a willow tree full of catkins and butterflies, with 7 Peacocks, 1 Comma and 3 Small Tortoiseshells present.