Hello again Alan,
Thanks for the help with the orchid ids, and I went back to Barley Cove today to see if I could make any more sense of them ....
The previous photos were taken three weeks ago when there was only one of the hybrids among about 40 of the Irish Marsh-orchids, this time there were very few Marsh orchids, most having gone to seed, and at least 20 of the hybrids. I also found a number of Spotted-orchids and in a different area two that seemed different again....
Below: Hybrid Marsh-orchid (D. x dinglensis), they all seemed reasonably similar to each other
Below: a couple more Irish Marsh-orchid (D. occidentalis), apparently many Irish marsh-orchids have unspotted leaves
Below: Heath-spotted Orchid (D. maculata) or hybrids, again many of the Irish Spotted Orchids seem to have un-spotted leaves just to confuse things!
Below: and two that seemed different again...the lower petals seemed much more tightly drawn back
Thank you again for your help, these are driving me batty!