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I'm presuming the pupa is of the same insect as the adults. If it is not I don't think it is possible to have safely identified it as the pupa of various Zygaena species are pretty similar.
You're quite right, David.
All the emerged adults in the immediate area looked identical so it's probably safe to assume this one woud be the same when it emerged.
I added the photo as an example. I don't know if that's accepted practice?
More photos here... http://www.flickr.com/photos/jcspace
But I have seen pupa of one species in the same area as adults of another so probably best to regard the pupa as only likely to be this species rather than IDd.
I've removed the image just in case. Apologies for any confusion.
Lat/Lng: 54.6339, -5.8551
OS grid ref: NW513333