Wildlife Spotting

That may be a good idea, they have an ID Q & A on their forum which we often use for ID queries and we encourage our users to do the same. They have quite a lot of experts on there who are very helpful.

Take a look at this one http://www.birdforum.net/gallery/showphoto.php?photo=382356 does not look as dark as yours, but they are all very variable. The Whinchat has no white patch on the wing and a very distinctive supercilium (white or pale stripe above eye). Could be a male juvenile, between when they are hatched and the following spring they go through many variations of plumage.

Saxicola torquata for all Stonechats, there's a third name which changes with sub-species, but in most cases they cannot be separated in the field.

The white spot on the wing is a give-away for Stonechat. There are many sub-species of Stonechat although only two of these are common in Western Europe. I base the juvenile guess on the fact that when you took the photo, in July, the adults are still likely to be in their breeding plumage.

Looks like a juvenile Stonechat.