I am not 100% certain, but these might be the eggs of the buff tip moth. They seem to have a sort of translucent quality as though they are about to hatch. When first laid they are white with a darker hole in the middle.
That's really interesting, they look like ball bearings!
I had a look too and came up with Tri-coloured Tigermoth eggs, but I don't think they're native to the UK! lol Oh well I'll keep looking....................
Guess we might not know what they are for sure, at least we had the experience of seeing something we think is pretty amazing. They did hatch, their enjoyment of being released from the eggs is shown below. We missed the actual hatching, wondering now if they grow quick or those larvae were packed into the eggs at that size?
I am 99% sure it was a leaf from the Quince shrub/tree. I think fruit is a generous term, I tasted one last year and it was quite possibly the sourest thing I have ever tried. It seem to completely dehydrate my mouth. Not wishing to make the jelly any quinces now end up finely diced in the mixed chutney.