This climber was in the walled garden at Gunby Hall in south east Lincs.
It was covering, and growing over the top of, a 3 metre wall. It
extended along the wall around 7 or 8 metres IIRC. The largest leaves
approach 15 cm in length. The flowers are around 2 - 2.5 cm across.

Plant:
http://tinypic.com/r/23uzw4p/9

Flower:
http://tinypic.com/r/33kdkj5/9

Any ideas what it is?

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Jeff