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Petals <=1.7 (2) x as long as sepals ... C.fontanum
Petals >(1.7)2 x as long as the sepals ... others (including C. glomeratum)
The petals seem short in relation to the sepals and the number of glandular hairs is not very large, so I think it is C. fontanum.
I have added a second picture whicvh is clearer - I think it shows the silvery edge to the bracts that would indicate C. fortanum
Lat/Lng: 50.7182, -1.8642
OS grid ref: SZ096909