Two of them are mentioned in my book 'Look Wot They Dun!':
24-02-73 – ‘Russell Harty Plus’ (UK): Cindy Incidentally(At last having a hit to rival Rod’s solo singles, ‘Cindy Incidentally’ got to No. 2 in the UK charts, though it only reached No. 48 in the US, where it was the group’s final hit)
06-06-72 – ‘Set Of Six’ (UK): Tweedle Dee, Tweedle Dum / Jesus Christ Superstar / Soley Soley / I Just Don't Know What To Do With Myself / Sacramento (A Wonderful Town) / The Talk Of All The USA / Samson and Delilah / Chirpy Chirpy Cheep Cheep(Featuring Sally in a white mini-dress, this is a fine live performance through-out, with Andrew Lloyd-Webber’s ‘Jesus Christ Superstar’ and Dusty Springfield’s ‘I Just Don’t Know What To Do With Myself’ being particular highlights)
Here's another song from the show (with original live audio):
Tina Charles is from 'Supersonic', 25-12-76 (taped 19-12-76), the same show as this:
The New Seekers is from Oz circa 71. The clue is the GFK? logo. The Kinks were interviewed on this show when they went for a disaster of a tour in 71.
It's actually GTK, short for 'Get To Know', an Australian show that ran from circa 1969 to 1975. Unfortunately, Australia didn't get colour TV until 1976, so this is why everything is in black & white.