This was the most fantastic walk! My eyes were open all the time for the tiny Green Hairstreak Butterfly which emerges at this time of year and we were fortunate to see a few, blowing past like leaves. They really are such delightful creatures and possibly my favourite butterfly. Keep looking for them throughout April on moorland. I've read that they're quite obliging creatures, crawling willingly onto your finger to drink the sweat therefrom! I don't believe it though as they always seem quite flighty to me! You could always give it a try to prove me wrong though.
Also saw this metallic green beetle which I think is a Rosemary Beetle, but am not sure, not having many good reference books for insects.