And here it is with a digger wasp. Click on any picture to expand it. David Lang told me that he had not yet taken a photo with this pollinating wasp and went back to try to get one. I hope that he succeeded.The male wasps, Argogorytes mystaceus are evidently fooled by pheremones and attempt to copulate with the flower, in the process removing the pollinia. The female wasps emerge some days later than the males, but once the females are on the wing the males realise the error of their ways and leave the orchids alone.
Source; "Wild Orchids of Sussex" by David Lang, ISBN 0-9533493-3-0.
I rambled on hoping to stumble upon a Man orchid to no avail, but did take other pictures.
UPDATE: In 2017 eleven orchid species were recorded on the hill thanks to conservation work by the Friends of Wolstonbury.
Green woodpeckers eat ants.
http://butterfly-conservation.org/872-790/silver-spotted-skipper.html for more information.