Thanks All,
I'm going to start rereading 'Mould Making For Glass' by Angela Thwaites , I bought it ages ago and found it a bit complicated , so I put it down .

Hope you all have a great time in Brum !..............
"......Glass is more gentle, graceful, and noble than any metal and its use is more delightful, polite, and sightly than any other material at this day known to the world. "........... Antonio Neri , 1612.
Nothing has changed since 1612 !