Bit late for a duckling.
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I don't know what might be classed as 'late' but I know a local patch has 4 at the minue which look like they would be a similar age/size. As well as 3 Coots which look like they have only very recently left the nest/fledged
Feel free to look at my ongoing (hopefully improving) collection of pictures on Flickr:
Lat/Lng: 50.7183, -1.96551
OS grid ref: SZ025909