davidcole: http://www.tvlicensing.co.uk/check-if-you-need-one/topics/what-does-your-licence-fee-pay-for-top13
And here it is. Don't upgrade your iOS devices if you currently have the app. It'll force information about your license.
Amazing that they still sell black and white licenses for a fraction of the colour one. Shows how slow they are with their laws. I suppose you could set your phone to black and white, and buy that if you want to get it a lot cheaper.