Jones and Co (Glass) Ltd, Ely House, Charterhouse Street London E.C.1.
They were a significant importer of Czechoslovakian glass, and I doubt if there was another UK glass importer who would have been using the "Astra" brand at the same time.
I believe now they are called Czech Crystal, and operate with a web-site www.bohemiacrystal.co.uk
I did talk to them last year whilst attempting to collect material for a book on glass imports to the UK, and the importers, over a 50 year period.
This project has hit several problems and is consigned to the back burner for the moment.