Common Bird's-foot Trefoil (Lotus corniculatus)
A member of the pea family with that classic 'vetch' shaped flower it is a very popular plant with insects and is the food plant for several species of moth and butterfly.
Sometimes called 'eggs and bacon' although I have no idea why as it does not look like an egg and there is no trace of any bacon!
The usual name 'bird's foot' comes from the shape of the seed heads that form once the flower has gone over. It looks just like the foot of a small bird.