Thank you very much.
EP was ringed on 10-Sep-2021. It was reported 13 times at Mai Po.
CR should be CA, ringed on 20-Sep-2020. It was reported 15 times at Mai Po.
PE was ringed on 2-Sep-22 and fitted with a GPS tracker, usually hang around MPNR and mudflats from Mai Po towards Mong Tseng Wai. Reported 6 times at Mai Po, once in Shenzhen Futian.
UC was also ringed on 2-Sep-22. Reported 4 times at Mai Po.
We haven't use YA flag on Redshank, and there are 10 flags which we have used which started with letter Y, so I am sorry that I cannot work out which individual it might be from your photo.
Katherine