I got a few photos of individual spikes, and, according to one of the people I follow on Twitter, they are Common spotted Orchids.
Common spotted Orchid
Another plant that was also in bloom this weekend was the Foxglove. This is a very common plant, but one that, surprisingly, hasn't been included in this blog before! Here's a picture of one from Saturday, again, from the top reservoir.
Whilst looking at the flowers, Luke and I also noticed a number of wasps chewing the wood off the boardwalk! Luke managed to get a few close ups, including this lovely, face-on shot (thanks for the copy Luke). I looked ont t'internet, and think it's a Common Wasp, due to the anchor shaped mark on its face (see here).
This second photo, of a different individual, also shows the line of wood that the wasp has chewed off.