And for the first time, I've noticed the first line of the introduction makes no sense! He basically trails something for the week afterwards.
It almost certinally was a pre-rec, because (and I'm right in saying the opener most weeks was pre-recorded as it set the whole stall out for the afternoon, so had to be flawless. US sports shows do this as a matter of routine) for the whole sequence/joke to work, Des had to play it straight, the sound effects from the scuffle had to be clear and yet let the visuals do the distracting work for the viewers and for the timings to work exactly.
My user name might look like Hatton Cross, but it's pronounced Throatwobbler Mangrove.