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This is a Northern Damselfly.
The marking on the second abdomen segment is within known variation (the 'spade' shape can be flattened, and it is not unusual for the markings at the side to be joined to the 'spade').
The pronotum shape is also exactly what would be expected for hastulatum, with the two halves of the rear edge relatively straight, and slightly angled away from a central point.
This is the best single feature to use for identification.
Other features which point to hastulatum are the pale bar between the eyes, the largely all blue ninth abdomen segment (Northerns often have black spots on this segment, sometimes - but not often - as large as in this example), and the greenish tinge to the underside of the eyes (not very obvious in these photos though - it is often very clearly green).
Unfortunately these species can be variable!
Hi Roy, I'll hold my hands up to a mistake on this one, the only excuses I'll offer is variability and it's not a species I'm familiar with.
I was not aware of the amount of variability in the S2 markings (I am now) and those black marks on S9 just seemed too large for the Northern. One to note for the future I think.
All very interesting though, this variability thing.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 57.0532, -2.8522
OS grid ref: NO484961