No fireflies in UK (I believe) but some areas (mainly chalky areas) do glow-worm walks. I went on one on Ivinghoe beacon in Herts, very interesting. The female lives in a small hole in the ground and comes out to attract males. If you pick one up, please put it back close to her hole.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I'd like to be a glow worm, 'cause a glow worm's never glum;
How can you be unhappy when the sun shines out yer bum?
https://chillywatch.wordpress.com/2017/07/27/glow-worms-at-barnack-hills-and-holes/
One of my favourite places. 😊
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.