[Picidae]

F is a Ferruginous Duck - male eclipse (most likely to be a captive bred bird in the UK but fairly common in Continental Europe). As is the RC Pochard.

Although the exotic ducks at Arundel WWT appear to be 'free', their wings will be pinned - some wild indigenous species join them from time to time such as Tufted Duck, Mallard, Teal and Shelduck etc.

The Mandarins at Arundel, while originally from collections, seem to be breeding outside the reserve now - you often see them sitting in the trees near the castle!