Who's Been Digging Holes?

I noticed yesterday that some strange, relatively small, round holes had been dug in my raised beds. I've just been outside and discovered this
Unfortunately, I didn't have my wildlife camera positioned anywhere that could have caught the culprit in the act. This morning we spotted a blackbird digging around in one of the other holes but I don't know whether a blackbird is capable of digging a hole that big or whether it's taking advantage of someone else's.
Answers will be gratefully received, I'm not chuffed!

Unfortunately, I didn't have my wildlife camera positioned anywhere that could have caught the culprit in the act. This morning we spotted a blackbird digging around in one of the other holes but I don't know whether a blackbird is capable of digging a hole that big or whether it's taking advantage of someone else's.
Answers will be gratefully received, I'm not chuffed!
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The blackbirds don't really seem to dig just peck around. Do cats or foxes seem most likely in your area?
Haven't caught any rats on camera before, only mice. Fingers crossed it isn't any of them!
If you live in Derbyshire, as I do.