Robin red breast

Have you seen the blackbirds following the moles, Mark. When the mole is active the worms come to the surface (the secret of worm charming) and a few blackbirds have worked this out and walk along the beds following the mole (I assume)!

I've not seen that but in the last week, where I sowed some carrots and been watering them in the dry weather, the damp likely attracted worms which attracted a mole which has dug through the patch where the carrot seedlings were. I've had a mole go all along a row of beans in the past. easier to dig and likely lots of worms.
Years ago I think I had a rat with a sense of humour, cant think what else would do it. A whole row of good looking carrots (from the top) were in fact just carror tops. Something had tunnelled under the row and eaten the lot.

That sounds like vole damage to me - they're not such good diggers as moles but good enough if they start off in mole runs. I've lost leeks, beans, cucumbers, artichokes, chard & even a plum tree to the little darlings. Often there's nothing left but a neat round hole, more often a collapsing plant above. I watched the cat catch & eat six from one raised bed in the space of an hour in the spring.