Now have reply from the T & W museum - as shown below - and I've discussed with them the fact that Ed. Moore weren't alone in producing a 'hobnail' pattern, which probably means that at the end of the day we're not able to be 100% sure about the attribution, but judging by the comments from the museum, they seem satisfied. If anyone wishes to comment further, please feel free.
"Hello Paul, thanks for your last e-mail. I have tracked down TWCMS2002.1254, its in our own museum here in South Shields. The plate has had a poor repair at sometime, but despite that it is a niece piece of glass, it was donated to the museum in 1973 by a local South Shields man.
Now the million dollar question did Edward Moore make it ? I believe it was made by the Moore factory here in South Shields in about 1880 ?. It is not in the 1870 cat, but it has all the Moore characteristics and the fact it was donated by a Shields man who no doubt had it passed down though the family. My book on Moore will be titled "Granny Glass"because here in the North East glass was passed down in the family, mothers to daughters etc. I hope this info helps and for what its worth i am more than happy to attribute your glass to Edward Moore's Tyne Flint Glassworks. Regards""