At the time. TVT was assembled in two parts - the outer pages were national and a separately stapled inner inset with the regional listings. For these issues the process had been reversed - the inner sections had been printed in advance during the strike, and the programmes went into the outer sections. This also happened once for the edition that carried the photographs of Princess Diana's wedding, when the same "combined" arrangement applied.
Ooh, I've got that issue and always wondered about it becauuse it's very odd. This was, as you say, two weeks after the wedding in 1981 and includes a load of photos from the event, and on the Saturday page it says "Due to the royal photo album, this week's programme information takes on a different presentation. It is, however, as complete as usual", and you get the national programmes billed and then a big box, filling up half a page, with individual listings for all the individual shows on ATV, HTV and Westward. I never worked out why that needed to be done like that.
During the 1982 World Cup there were a couple of issues where the regional variations weren't included due to a dispute, I'm not sure what that would have been. As they had alternative schedules for the knockout stages, they also changed the presentation on those days so there were billings for all the programmes that would potentially be shown that day, without times, and then a column featuring the two alternative schedules.
I've also got a Wales issue of the Radio Times from March 1983 where, where the local radio pages were in the English editions, you'd get S4C listings, but in this issue those two pages are completely blank save for some tiny text saying "We are unable to print S4C listings this week due to an industrial dispute".