Hi Arthur, and welcome to the GMB.
There are a few places around that can repair glass, although it looks as though there is a substantial amount of glass missing that might require the whole base being replaced - but I'm no expert so can only surmise! :roll:
I know of one place in Stourbridge: Redhouse Crafts 01384 399460, but have no experience with them.
But perhaps someone else can suggest glass repairers closer to Arthur in the  north-east?