Willow Or Willown't?

No don't worry, the title makes little sense to me either.

It had been the sort of day that made dishwater look bright with next to nothing on show. I was coming back through the top of Willow Wood when a little bird popped out in front of me. Just as I got it in the bins it flew but it was very obviously either a Marsh or a Willow Tit. Very frustratingly I had got nothing on the bird, from what little I saw it just wasn't right for Marsh Tit but equally I got nothing to stand it out as a Willow. It didn't call and I gave it 15-20 minutes before it became clear that it wasn't coming back. Worse still, I would've got positive on the bird but I was checking my pager when it turned up and so by the time I got out my bins etc I had almost no time to view the bird. If I hadn't been checking I would have been able to call it one way or another. Bloody hell. I twas an area in which I hadn't seen Willow Tit and as with everywhere, they're bloody rare and elusive, therefore I have to err on the side of Marshie because there's little else I can do. Typical.