Kitchen Garden Forum

Hi everyone, down on our allotment we are getting small thin worms eating into all our greens mainly cabbage and sprouts , for all intense and purpose they are a garden worm they grow up to 3 cm in length or and inch and a quarter very thin and fast moving they look like a common garden worm I though at first they could be a blood worm but they don't seem to grow big enough has anyone any idea what they could be , I am at a loss I've never seen worms like them before