Nipped out for a quick look around but only got as far as the mere before the mist came down. 6-7 wigeon milling about out from Britton Hide, one was roosting but popped up its head and revealed quite a noticeable dark teardrop. It promptly tucked its head under its wing and only gave a brief stretch when a moorhen got too close. Afraid photo not very good (even for me!) but thought it might be worthwhile - its the one at the back.