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I think it may be broad leaved willowherb - Epilobium montanum but I am not confident enough to change identification.
That was my first thought, but the stigma seems not to be divided into 4 (though it is not always obvious).
My Flickr photos...
Thanks for the comments. I'll take another look at the plant the next time I'm near it and see if I can get more evidence on the stigmas of the various flowerheads. It may be difficult to identify this one though - NE Scotland records (http://nesbrec.org.uk/modules/biomaps/index.php) list sightings of quite a few different Epilobium species in the area.
Lat/Lng: 57.16, -2.2
OS grid ref: NJ880076