This is a wingless insect belonging to the order Thysanura, and the family Lepismatidae.
The 3 very long caudal filaments should allow us to rule out the genus Lepisma (containing the most familiar Thysanura, L. saccharina, the silverfish).
Genus could possibly be Ctenolepisma but that's just my guess.
Thank you for that. I think you're absolutely right.
A little concerning that they like to live indoors and appear at night considering I thought they were coming in from a bush outside.
Thanks very much for your help.
It would depend on where these are being found - perhaps DB can tell us.
Ctenolepisma longicaudata is only occasionally recorded in the UK and almost wholly in association with shipped goods.