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It is probably just standing on one leg to keep the other foot warm and it looks like a domestic goose
No however they where all like this. I was at the London Wetland Centre and i stayed their for quite a long time and they did not move and their leg was always hidden if it was hidden. But thanks for the advice and the answer.
Lat/Lng: 51.4793, -0.2305
OS grid ref: TQ229770