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It's very difficult to sex common frogs outside of the breeding season, and this could equally be a male or female. It probably looks fat because it has inflated itself as a defence tactic. Common frogs will do this if they are threatened in order to make themselves appear bigger to potential predators.
Interesting. Thank you for your advice. I believed it was female due to markings.
Lat/Lng: 51.6173, -0.2422
OS grid ref: TQ217924