It isn't a feral pigeon, the ring can be traced back to the owner and the race rubber on the other leg shows that it has probably been to a race recently, the blue ring if its a GB ring indicates it was a 2004 hatched bird, if its an NEHU ring its a 2005 hatched bird - if its from any other organisation I don't know, my sister lives in Buckhirst Hill, Essex, but has no interest in pigeons ( just a bit of useless information really ) I'm 250 miles North................