Lovely capture Mark. I've only ever seen female Mandarin wild, the only males I've seen were at WWT Martin Mere as part of their collection :o)
Hi Mark and welcome to the forum, great pic & interesting to see the Mandarin in the company of a white Mallard, had a pairing like that in River Stour in East Kent many years back!
2013 photos & vids here
eff37 on Flickr
Great photo Mark. Welcome aboard. Love to see Mandarins. They always amuse me, they look like they have been painted. Kind of like an ornament ...