The John Bishop programme had to be postponed due to running into an immovable object, in the shape of a Michael Palin series. It ran into this object due to the insertion, halfway through the WDYTYA series, of a Panorama Special, on care of the elderly.
In my opinion, WDYTYA has been going downhill from the time they did not feel obliged to feature at least one paternal and one maternal ancestor.
Hibee