Have a look at the archived pages here : https://al.zerostem.io/%7Eal/teletext/bbc1/1984-09-04-0060.1/
Teletext pages in the 700 range contained the Telesoftware programs
I would imagine Visicode was similar fare although, for reasons I discuss in the article, they're not very easy to find any more.
OP here. Thanks for the heads up (Ed's up?). That looks like a good newsletter