nickp... Have just listened to the show on the Beeb website, and no signs of cracks, jumps etc there!!
I'm presuming that the broadcast was from a CD-R, (Most progs are now, except for a few traddies who still work with tape...me for instance!!), and , although a very convenient way of getting a programme to air (No whirling metal spools to amputate unwary fingers, etc!) The downside is that any imperfections on the disc can cause glitching. Maybe this is what you heard?
Anyway, A fine tribute to Sandy nonetheless....Should have been the whole evening though IMHO !!