Cannot quite make out if there is a sharp 'keel' along the underside of the leaf (making it a sort of crushed Y shape). If that is present then it's very likely to be Three-Cornered Leek (tho. that is generally found in the southern part of the UK as it generally requires a warmer climate). If the flowers appear as white bell-shaped types, along with the 'keel', then it is 3CL. The leaves are too thin to be ramsons, and there also appears to be a midrib or reinforcement in the V bottom. Ramsons leaves, even when they are young, are almost flattened, and they also begin to quickly broaden out as they mature... unlike the more grass-like leaves in your pic.