I agree. Certainly the most likely. From British Dragonflies:
Flight Period: June to October (sometimes individuals in May and November)
A large, inquisitive Hawker usually seen individually. It may fly quite close to investigate observers. The spots on segments S8-10 are joined, unlike other Hawkers. The ante-humeral stripes are broad and strongly coloured. The costa is dark and there is an elongated triangular mark on S2.
Male: brightly marked on a dark background, usually apple green except for S8-10, which are pale blue. Occasionally, all pale blue marked individuals are seen.
Female: brown with bright geen markings.
Habitat Breeds in water line vegetation in well-vegetated, small ponds, often in garden ponds. Hunts well away from water and may be found hawking woodland rides well into the evening.
Status & Distribution Very common in southern and central England and Wales, more local elsewhere (vagrant only to Ireland).