I'm not sure if it was part of 1989 rebrand or if this happened during the 90s but they also rebranded Ceefax into two parts. BBC 1 Ceefax was At Speed service which was basically a stripped down service, more stripped than it is now and BBC 2 was a In Depth service which was basically every page. I'll guess they did this so the BBC1 service was just quicker to load.!
That was the 1992 relaunch, when they had the blue border around all the news stories -
http://teletext.mb21.co.uk/gallery/ceefax/bbc1-100-0394.gif
The distinction is still there, just, I think, certainly BBC2 is still a bit slower than BBC1. I didn't get a teletext telly until 1993 and before that I could only see it at my grandparents. Breakfast Ceefax was demented, it was in the same style as the newsflash but had all the day's news, weather and sport on it, seemingly so you could watch Ceefax and Breakfast News at the same time. But it changed so slowly, and had so little information, it was quicker just to go to the normal Ceefax pages.