So as not to derail the Mrs Thursday thread and after a search I thought I'd open a new one, hope that doesn't tread on anyone's toes.
Quote: Hercules Grytpype Thynne @ 12th September 2021, 2:52 PMBy the way, are you thinking of this? As I've listened to many ISIRTA over the years and have no recollection of the team doing a skit............................fits the bill
Bill, get it?
I certainly remember that song from Bill, I sang the 'be sure to button your fly' line before it appeared 
I had several series of ISIRTA on cassette but sadly they failed to survive a couple of moves.
The skit I partially remember about Two-way Family Favourites was performed by two artistes each portraying Jean and Cliff and was presented in a 'lovey-dovey' style - "Are you there Jean?" "I'm here Cliff are you there?" "Yes Jean I'm here" so I'm assuming it was Jo Kendall and one of the chaps. It was one of the few radio shows I listened to regularly but maybe I'm misattributing it to ISIRTA.
There are 129 
episodes of ISIRTA available for free download on this site I came across while trying to Google the sketch. I may end up grabbing them all just for peace of mind.
Without trawling through the whole site most of the shows appear to be American, at least they're not ringing any bells.
Join the club - I've got cassette cases and cupboards FULL of radio cassettes I have collected over the years, and a lot of my own reel to reel and ones I bought at boot sales.