I'm not sure that I've found the correct images but there are two photographs of a bird of prey flying away carrying prey, apparently taken on 21 July 2014 and labelled 'Hen Harrier with Prey (A Chick)'. I believe the raptor depicted in both these images is a Sparrowhawk.
You did find the right pictures. I think the author got a bit over excited and and named it Hen Harrier (he does that sometimes!). Thanks for the I.D.!