I don't think it is a "real" one, Ian, or at least not one that was designed and sold from Bridgwater.
There is a company using the Thorn name that produces children's and youth bikes; you sometimes see them offered on eBay and they use this font. Look real close at the tube joins; the rolls look more like MiG welding than Thorn's cleanly overlapped TiG beads. Quill stem, lower-quality components, brake bridge is incorrect.
All the best,
Dan.