unknown Moth Avenue 29 May 11

unknown Moth Avenue 29 May 11

Observation - unknown Moth Avenue 29 May 11 - UK and Ireland. Description: Whilst working with some volunteers clearing Himalayan Balsam 2 or 3 of these moths flew up. I've checked my field guide (Paul Waring & Martin Townsend) but can't anything like it. Any suggestions?

Whilst working with some volunteers clearing Himalayan Balsam 2 or 3 of these moths flew up.
I've checked my field guide (Paul Waring & Martin Townsend) but can't anything like it. Any suggestions?