Rats!

I didn't want either:-
Yet another Blue Tit.
or
A Blue Tit's bum.
HOWEVER ...
I have this bad habit of setting the camera on the old 3-legged Pod, with Remote release (He tells me) just on the off chance of a shot through the window. This was, I think, arguably my best ever shot of any bird, any where, any time; so I couldn't not, if you see what I mean.