Voles are my guess, as it's about the right size hole, and there is no pile of dirt like you get from moles. Although, voles are usually always my answer for these sorts of questions, as I have battle them in my own garden for several years. Hopefully others have suggestions.
Yep, I think they are having a party on my plot at night? My neighbour has the holes too beneath his cabbages, same as me, wish i knew how to deter them?
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