The Kellyanne conway guide to white-winged gull identification

This bird has been a pain and the viewing conditions on the first two days even more so.   We just cannot find its feeding area to get decent views - it just appears on the roof miles away.  Today in calm weather the identification 'clearly' pointed towards a 3CY Iceland Gull - the first thought after a couple of seconds after it was initially located two days ago!  However, I don't understand why brief views on the south side of the roof yesterday showed a coffee coloured mantle and wing coverts contrasting with white flight feathers!  Here is the best pic by a long way (and it was) taken so far by Janet

Plenty of Wigeon today - at least 205.