Barn Owl site witheld

Went with Roy to check out a potential Barn Owl site and found the above sat on a wall. Digi scoped shots however shows the bird with a blue ring on its leg, as far as I know not a BTO ring so probably of captive origin. However the bird showed no sign of wear on its tail and flight feathers a feature captive birds sometimes show. Because of the possibility of breeding the site is withheld. If no one has objections I will post results of the Leo and Shortie survey soon, no sites will be given, all comments welcome.