Not sure Marsh / Willow, and I was unable to get better photos although this tit came regularly to the feeders. This garden is on a woodland edge.
No interactions present.
The bird in the bush in the righthand photo has a pale spot on the bill (which is just about visible if you zoom in) which is a very strong pointer towards Marsh Tit.
The bird on the right in the lefthand photo is a Coal Tit - I wouldn't like to say what the one on the feeder to the left is!
I couldn't crop the coal tit out as it made the photo too small (it has its own observation), I'll edit!
Certificate in Contemporary Science (Open)
...except, now that you have switched the photos around, my ID's in the above comment refer to the wrong photos/birds! ;o)
I think that it is better to have the photo that more clearly shows the Marsh Tit on the left though - and presumably the partly hidden bird on the feeder, in the photo with the Coal Tit, is the same bird?
Shall I leave it or re-order them? Yes the bottom and tail are the Marsh Tit.
I was thrilled to see it but it was so frustrating watching through my relative's kitchen window (whilst washing up) and trying to be sociable at the same time! I would have liked to digi-bin them really.
This way round the photo that better shows the subject bird appears as the thumbnail before you click on the observation.
Besides, it won't be the only time that people might get the impression that I don't know what I'm taking about (...and sometimes that impression will no doubt be correct!).
Your reputation is well deserved and secure and I doubt it would ever be thought otherwise!
Thank you for taking the time to help a meer mortal!
Lat/Lng: 52.0888, -2.8025
OS grid ref: SO451436