Hi Roz,
Alas there is no more general book on Mdina! As far as I am aware, there is only information on Mdina in the following books:
1 or so illustrated paras in Nigel Benson's small 'Glass of the 50s & 60s' book for Miller's
A couple of pages in Leslie Jackson's '20th Century Factory Glass', that also take in IOW glass
The pages in Andy's book, which you have.
My book
The issue with lots of later Mdina, post Michael Harris, is that it is virtually undatable - at least only to a period anyway.
That's all I can remember right now, and may be all in total!
All the best,
Mark
www.markhillpublishing.com