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i have now seen some photos of mandarin ducks and i don't think that this is one now.
If you look at the wings you will see that the primaries (the longest flight feathers) are missing from the left wing - they are visible on the right wing as backwards protruding feathers with white on the tips.
This shows that the birds wing has been "clipped" to make it difficult for it to fly - so if it was not brought to the lake where it was seen, it is certainly a recent escape (clipped birds do sometimes manage to escape, but they generally don't go far).
Lat/Lng: 51.4216, -2.7523
OS grid ref: ST477694