Just harvested some radishes. some have split; most have some part of the outer skin it looks like, but might no be, eaten away.
Phone on the blink, so can't show photo.
If they've been eaten, that's probably slugs or snails.
If the skin has split, that's probably down to erratic watering.
Thanks for the prompt response. Out of interest how frequ should they be watered so that it's not erratic?