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The tail looks too short for a wagtail and the body too "chunky" Northern Wheatear (Oenanthe oenanthe) I think. Looks like a typical pose as well.
Hope this helps
The pale Supercilium (line above the eye), rather than through the eye, the dark mask from the lore to cheak coverts, the length of the tail, the lack of obvious yellow on the undertail-coverts and lack of any obvious white markings on the primaries all add up to Wheater rather than Grey Wagtail. Although I must admit, at first glance it does looks like Grey Wagtail next the water like that so it was an easy mistake to make.
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Lat/Lng: 50.1, -5.1
OS grid ref: SW8032