iPlayer Radio
Several people here have commented on the iPlayer radio. Because it asks for me to sign in before it will allow me to use it, I don't.
iPlayer on the TV is getting ever more enthusiastic about signing in too. If it makes it mandatory, I will stop using it as well. I am in the UK. It is quite detectable by my IP address that I am in the UK. I cannot think of any other legitimate reason they need to check.