About 5cm frog, jumping around really quickly (hence not a very good ID'ing photo.)
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Don't worry, the photo is fine for an ID. The smooth skin means it's a frog and you can see the dark mask which distinguishes the common frog from any of the introduced green frogs.
From what I could see it did have smooth skin and definitely had long legs, it was jumping all over the place! Thanks for the ID.
Lat/Lng: 51.342133, -2.692805
OS grid ref: ST518605