Allium ursinum Ramsons C DD N
Ramsons tends to grow in patches by streams and in wet woodland places. You can find it by smell alone. If you don't like the fragrance of garlic however, a large patch of Ramsons in warm weather can be overpowering. This plant covered a valley bottom in Lancashire and the name of the nearby village was eventually shortened to Ramsbottom - nothing to do with the rear end of a sheep.
This is one of our commonest wild plants and apart from some of the high hills in northern Scotland is found everywhere in the British Isles.