This frog or toad was sitting on the footpath by the river and didn't seem bothered by us walking close and taking pictures.
No interactions present.
As Roger says it is puffing itself up to look larger and more aggressive than it is; obviously thought you wanted to eat it! Not something I would recommend as they produce, when threatened, a nasty tasting alkaloid from glands on their head and legs. Some of the tropical toads produce hallucinogenic substances from these glands and shaman are known to lick these toads to help induce a trance, yuck!
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Yup, tis a toad!
Lat/Lng: 51.5, -1.2
OS grid ref: SU6079