I don't know what that page from 1979 was then, unless they were broadcast from Westward for Channel's benefit, or they got the year wrong (would have to be either 1984 or 90 for the 25th July to fall on a Wednesday), though the graphics are clearly based on the pre-1980 logo.
It’s possible the date is displaying incorrectly. Another screencap I have seen of a teletext page retrieved from a 1985 video recording clearly said Thu 15 Sep, but should have said Thu 5 Sep. Apparently the poor reception caused the space to be replaced by a 1, for technical reasons I don’t fully understand. So the numerical part of the date of that CTV Oracle page may not be accurate.
Cut out the coupon in your TV Times!