The damsels are lestes sponsa, emerald damselflies. Great shot of a mated pair. The male of a pair once mated hangs onto the female while she oviposits (lays eggs) to make sure the kids are his. 
Emeralds are so rare around the Bristol UK area, I'm already jealous, but these black darters, I've been hunting forever for these and I'm green with envy. I'm biased, but this is a super set simply because they're not easy to find. You found them and made the most of it with some very nice pictures. The common darter is nice too, but a bit oversaturated (don't want you to get too big headed.
)