Peacock (Inachis io) - Female (left), Male (right)
After some considerable time with the male following the female about on the ground, the female flew off closely followed by the male.
Female Large White (Pieris brassicae)
Female Green-veined White (Pieris napi).
Female Small White (Pieris rapae)
To easily identify the difference from a Small White compared to a Large White (the size notwithstanding, which is not so obvious in the field sometimes). With the Large White, the dark tip on the forewing extends down the side of the wing, whereas it doesn't on a Small White.