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I should have paid more attention to the leaves. My guide doesn't mention the flowering season for sweet-briar or I might have eliminated it.
Paul Seligman. Flickr: http://www.flickr.com/photos/paul_seligman_cardiff/collections/721576087...
... for Rosa rubiginosa is the presence of apple-scented glands on the underside of the leaves (rub your fingers on the underside of the leaves and then sniff your fingers), with the proviso that some related (but rarer) species (e.g. Rosa micrantha) and some hybrids (e.g. Rosa x nitidula) also have this trait.
... or it might have been Rosa x nitidula; the scent from the leaf glands wasn't very strong.
The glands on the hips seem to be the strongest.
Fantastic for making rose water with, and then turkish delight, but rubbish for making rose hip syrup with.
Lat/Lng: 51.48591, -3.26689
OS grid ref: ST121770