Thanks Dove and Lyn I have moved them from the weeds I have been disposing of and placed them to other weeds outside of mums garden. I assumed they were enjoying that particular plant even if we would rather not keep it!
Willow herb is the preferred meal here. Mum has a small patch of earth by her front door which is a haven for anything windbourne so is overgrown with the stuff at the moment. I’m removing it before it turns to even more of a problem.
Posts
https://ukmoths.org.uk/species/deilephila-elpenor/
I had lots of them last year, haven’t seen any this year, maybe a bit early yet.