The second tunnel was warmer at 6 degrees (the sun now stronger outside and the thaw setting in) and here we had 23 Natterer's and 5 Daubenten's, great stuff and so many were unexpected. This time, we encountered 2 Daubs hanging.
The Bats seemed on the whole unaware of our presence, but one or two began to stir (possibly a natural reflex impossible to say) so we wasted no time in counting and leaving them in peace.
I decided it was worth a quick look for the Slavonian Grebe present on Whitlingham Great Broad, and as luck would have it the bird was showing close to the car-park and I was able to get other birders onto it.
A cracking morning, the Bats proving a fine antidote to cold Winter birding.