Ring-necked Duck

Certainly that is an adult drake Ring-necked Duck! The second bird appears to be a female Pochard, but it looks very small. I've tried to turn it into a female RND, but I can't - the features that you might expect to see are not very clear on the pics (e.g. bill pattern, eye ring/teardrop behind eye, pale half moon at bill base), and the body/mantle colour is right for Pochard and wrong for RND.

This pic shows female RND & Pochard side by side:

http://www.robwilsonphotos.co.uk/ringnecked-duck-image-p-1912.html