SKY has made some changes to the channel numbers on its satellite service this week in a fresh shake-up. It's been a busy month for Sky, with a number of channels already closing and launching.

SKY has unveiled a massive overhaul to its channel list with more than 30 set to move tomorrow. The huge shift includes a number of BBC stations, as well as favourites like talkSPORT and Capital FM.

But how come the channels get assigned their numbers in the first place? Well, luckily for us, journalist Marina Hyde was asked just that on the behind-the-scenes showbiz podcast The Rest Is ...