[Happy2001]

Makes sense for Glitter to be excised obviously, but why were Bing Crosby and Ian Dury edited out?

Bing: Interestingly you can here the start of the 1986-88 intro which preceded Bing originally as it transitions into the next link in the 2001 version.

Ian Dury And The Blockheads: The Blackface Drummer is why it's been edited out of this and the recent repeat of Christmas Hits. Slowing down the show on iPlayer shows that it was in the 2001 version but it's been covered over by Rat Trap which came after it originally.