I think that the bottom shot is a female Willow Emerald Chalcolestes viridis. It has the characteristis light stigma with dark edges, but you have to be a bit cautious about using only that character 'cause tenerals of other species can have pale stigma. But the thorax has the thin yellow line at the top and the wavy edges to the pale patch with a bit of a "spur" to it and the ovipositor has a pale patch on the lower valve. This is a relatively new species in Britain and is spreading rapidly, so depending where you took it, may be an interesting record. Anyway, it is well worth reporting to BDS and getting properly checked out by their specialists!
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