Okay, I googled up the ebay listing:
https://www.ebay.co.uk/itm/265426509189
It's certainly not a Galaxy or a Lightning. The 531 sticker looks authentic, and identifies the frame as 531 butted main tubes only. The fork bend and clearances are a bit too sporty for a Galaxy, and the quality's a bit too good for a Lightning. The components look like a good fit for the Jaguar - VX derailleurs, sidepull brakes, what looks like a fairly narrow ratio 6-speed block. I'd say early the eighties Jaguar is a pretty good match.
The thing that throws me a bit is the clip-on rear brake cable. Catalogues show braze-ons for the cable along the top tube, and I can't find another Jaguar in that colour.