Well an hour with the solvent and gloves and vapour mask sitting in the sun and getting rather warm has certainly cleared most of the lacquer off the top leaving just the tinted clear on the body with about 15mm of dark round the edge, which I could probably leave alone. The back had a lot smaller central yellow area - which I would have liked to have redone as well, but now I can do it. But I think I need more sanding work on the dark bits to reduce its thickness otherwise it will take for ever trying to do it all with thinners. If you use too much, it just makes a sticky mess that's hard to remove, so you need just a little bit of it at a time.
So once the remaining thinner vapours have evaporated, I'll go back to some sanding before the thinners. I'll just sand the sides as they only had the tobacco lacquer and there's no 'burst on those.