David - This interests me because, as some of our members know, my second career was investigating (as well as trying to prevent) explosions in factories. Any sort of explosion in a glass works, much less a fatal one, is a rare event. In 19 years in that job I was only inside glass works' a couple of times and they were not the result of any incident. Some other industries were regular customers! Earlier, Sowerbys and Joblings each had a small, unreportable one while I was there, without any injury.
The local papers might be one possibility. Also H M Factory Inspectorate (HMFI) had been around for decades by your date and it is just possible that some record might still exist especially if the bang were technically interesting. The records of local offices will have vanished but HM Chief Inspector published an annual report which sometimes mentioned interesting happenings and they would certainly be preserved. HMFI became part of the Health and Safety Executive (HSE) from 1974 and their central number for information is 0845 345 0055. Everything will depend on whether or not your glass works was a "Factory" - there were in those days rigid legal definitions of this which may have excluded a small, hand-blown works. Although I was an HMFI inspector I no longer have any central contacts and I could do nothing which you can't do yourself, but I think you will find they are very helpful.
Good luck anyway and you know where to find me if I can help at all. I'd love to know the answer if you ever find it.
Adam D.