Which UK flowers will attract butterflies in my garden ?

I am thinking about planting some flowers in a small patch in my garden to attract butterflies.

Its a very shaded patch with only about 2 hours os direct sunlight a day. if im lucky enough to have sun shine lol .

No special reason for attracting butterflies other than seeing my daughters faces light up when they see them flirting around. :)

Which UK flowers will attract butterflies in my garden ?
Buddlieia-----or common name is the Butterfly Bush.