Uknown passerine

Uknown passerine

Observation - Uknown passerine - UK and Ireland. Description: I saw this bird in Marston marshes in Norwich. It was in some trees around there rather than in the marshes themselves, although, the trees grow right next to the marshes. It wasn't making any sounds, it was very small and I really didn't get a good look

I saw this bird in Marston marshes in Norwich. It was in some trees around there rather than in the marshes themselves, although, the trees grow right next to the marshes.
It wasn't making any sounds, it was very small and I really didn't get a good look at it but I managed to snap these two photos of it. When I looked at them I had no idea what to think, those stripes don't look like anything I'm familiar with.