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Hybrid(?) duck, Manchester UK (1 Viewer)

I would put some weight on breast color, as the paler breast (or as you say, more orange breast) is something that can occur in Mallard x Eastern Spotbill and in Mallard x Indian Spotbill.
However, you can also have this paler breast color in domestic mallard or birds with some domestic ancestry. As it shows further features like bill pattern, weaker tail curls than mallard, it ticks some boxes for having some spotbill genes. (Note that variability in phenotype is high and hybrids are fertile and backcrosses occur

Here are some links to Indian spotbill x mallard with paler breast:

Here is an eastern spotbill x mallard with paler breast

In this thread are links to some other eastern spotbill x mallard to see the high variation

BUT as said, Steves duck also shows involvement of a domestic dwarf breed of mallard ( the Call duck)

and head pattern would be unusual for a first generation cross mallard x spotbill, I think.

So in the end we do not get any further than : It looks like as if it has some spotbill genes ... and should leave it at that unless someone is going to get some feathers and does a DNA analysis ...
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