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I'd agree with Phyllobius sp. - a small green weevil with antennae inserted more dorsally than the quite similar Polydrusus weevils, but I wouldn't call this a "leaf beetle" which means family Chrysomelidae to me, but common names are very inconsistent so no doubt it is used sometimes for these weevils.
Nick Upton, naturalist and photographer.
Lat/Lng: 51.9657, 0.1433
OS grid ref: TL473318