Spot on mate, though I think I know who she belongs to.
A bunch of kids from the area have a couple of lurchers and I saw them a few months ago digging for a ferret nearby where I found her (no collar that time either), plus I found a dead hob last year not far away, so I think it's them. I have some sympathy for them because none are over 14-15, but to do it on a regular basis isn't on imo.
I did speak to them about getting a collar but it fell on deaf ears I think, plus they have no permission there and used to do a runner from me till they realised I wasn't the landowner, so may have legg