Shoo fly plant. Nicandra physalodes

That's pretty! Looks like a climber, is it?

As Owdboggy says Shoo fly plant.
High light this web site Below and it will give you info on it.

http://apps.rhs.org.uk/advicesearch/Profile.aspx?pid=538

xx Jackie xx :o))

Thank you very much for the answers above - and for the RHS reference - very helpful. I will now name it on my photos!

Lubeelu, it's not a climber though it stands quite tall - 4-5 feet, supported by our runner beans!