That's just weird. I know a couple of professional entomologists (hoping that this isn't sufficient for me to get me overheard the 'golf club bar')- I'll ask them about it this week.
Mrs M_V is away out to see if she can find them and see what they are up to now. There was a pair of them in fairly close proximity (on the same paving slab). We looked around and couldn’t see any more of them.
In my back garden which is suburban Glasgow!
Wondered if they could be something to do with greenfly as they were on a paving slab underneath a sycamore tree that’s badly infested.
They really pop and jump!