Thank you very much for such a prompt response, Sally. I will have a search through those directories etc.
By way of background, I am working on the post-excavation analysis of the excavation conducted by Pre-Construct Archaeology of the glass factory on that site. Everything found fits in well with the map and print evidence. I have put together more about thee ownership of the factory - Samuel Neville (former partner of John Sowerby) took it over for 9 months after Greener left - but Thomas Walton is new to me.
Incidentally, all the glass working debris I have studied does not include any glassblowing waste, just pressing waste. Sadly, the waste from earlier working regimes (French, your Walton) must have been cleared out during remodelling of the building.
Thank you once again.
John