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It looks like it is getting ready to spawn at the wrong time of year.
It might have something called 'beer belly'. I think that this is when they fail to mate and have infertile eggs inside them. However the eggs just dissolve into its bloodstream after the mating season is over.
It has most likely inflated itself as a defence strategy. Many frogs and toad will inflate their bodies when they feel threatened so they appear bigger to potential predators, hopefully big enough that any potential predator would have second thoughts.
Lat/Lng: 51.59476, -0.14893
OS grid ref: TQ283900