Marsh Tit or Willow Tit?

I’m none the wiser. I watched the BTO guide, and apart from a distinctive call that would point to Willow Tit, I couldn’t say. You can here the call around 2:15 minutes into the video. It might be the willow tit. Or it might be something else entirely.

I’ve not managed to get any clear still photographs. These are the best so far.