Hi Paul,

Thanks for your observation!
The deletion was correct. Llangwm was a separate community until 2022, when it was merged with Llantrisant Fawr. I meant to delete it when I made that edit, but I must have missed it and someone else got there first!
By the way, there is still another community called Llangwm, in Pembrokeshire: https://www.openstreetmap.org/relation/11180866
Regards, Colin