I didn't have my lens, so these handheld, phonescoped shots will have to do ...
I had a bit of time on Wednesday to sneak out to the river at low tide and was greeted by a 2cy Caspian Gull resting on the spit by the River Cafe. When it got up, it revealed a red ring - amusingly, the combination read 'G0UT'. I'm waiting for confirmation but it sounds like this bird was ringed at the weekend. Also present was 2cy Herring 'A4ZT', which has been hanging round here of late. Having reviewed photos, it turns out that good old G0UT is the ringed bird I saw poorly on Monday.
2cy Caspian Gull 'G0UT', Hammersmith, 29 March
Phonescoped Black-tailed Godwit (& Redshank), 24 March