Massing Meds

C. 500 Med Gulls at Llanon this afternoon, including at least 9 colour ringed birds. Managed to get all bar one of the codes. Has anyone else seen Green ?2RG, if they have would you let me know what the first number/letter of the code is (or keep an eye out for it). There was a further c. 50 Meds in fields next to Aberaeron rugby pitch including another colour ringed bird - 3NPH.