
Cheers Dave - unlike OWH (and I assume other sites based on your experience), at Oxenbourne I have never seen or found eggs clustered in one area. Perhaps it is because the colony is so tiny. I have also noticed that (unlike some species) the eggs are easily dislodged and sometimes laid on what would appear to be almost bare earth.
Yesterday I got lucky and within 20 mins had found 2 females - one very fresh, the other not so much. The fresh individual was about 4" off the ground with wings open but as I pressed the shutter she was off. It would be nice to be able to spend more time with one of my favourite butterflies: