Unknown bird

Unknown bird

Observation - Unknown bird - UK and Ireland. Description: The bird in the photos was not much bigger than a Wren and seemed to be accompanying some Blue tits and Long tailed tits that were in the same tree. It seemed quite plain except for the markings on the edges of it's wings. I don't think I'm too bad at IDi

The bird in the photos was not much bigger than a Wren and seemed to be accompanying some Blue tits and Long tailed tits that were in the same tree. It seemed quite plain except for the markings on the edges of it's wings. I don't think I'm too bad at IDing birds but have never seen one like this and so far haven't been able to identify it from the internet for birds that you'd expect to find in the UK of this type of size.