Oh interesting, would these be the larvae then? A quick Google tells me that we have over 60 different types of native ladybugs here, so I'm gonna have to do some searching. Thanks.

And yes, I realise bugs all have their role to play and aren't inherently good or bad. But I was looking for "is it likely that these clustering bugs are killing my plant", i.e. are they a foe in this situation.

I think you've already had plenty of replies here, but yeah here in western Europe, straight from the tap. I'm also fortunate not to have any chlorine in my water. It's delicious.

One thing about the chlorine, it also just evaporates over time without boiling. Filling a jug of water and leaving it standing around for a while will also get rid of that chlorine smell/taste!

That sounds fun! I was actually thinking about doing something similar, but only about a few ones I think are special. Would love to see it.

Edit: what I mean is, I think it'd be interesting content, not that I'm in any way trying to "compete"!