The idea of Telesoftware was very good -
But incorporating "text as data" in what was basically a Text Processing system was always going to give probelms.... let alone the amount of transmission time it was deemed to use.
in 1989 there was not the Teletext Processing Equipment which the BBC specified and installed in the 1990s which ended up with Ceefax engine outputting 1 and a half more VBI line pairs than were emitted - which gave an extra 3 pages every second.
slide pack for details (and history - 1989++)
If Telesoftware had used Packet 30 or 31 Databroadcasting things may have been different -
After all it was a very good service for many customers ..... like Stock Exchange Corals Cardcast
Flashing Patches were also great fun but in those days because of Overscan and the Curved edges of TV screens they had to be more in picture than you woudl like!
_ although on one occastion I did one that scrolled the data across the screen as an "Arty" border to the text scroll beneath - but that needed an extra Keyer as well !!!
And the data rate was not that good!
But other than Satelite images i don't think Telesoftware was missed!