As of today BBC Radio 1 thru BBC Radio 4 are available for most users — living inside or outside of the UK.
BBC National stations have long been available outside the UK by using their Real Networks stream — desktop had the download/install/browser plug-in hassles. Unfortunately, few connected devices support Real Networks streams which kept these (most popular global) stations off limits.
Now the rest of the world can join UK users and enjoy the major BBC stations globally thru the Windows Media streams.
Now most RadioTime users will find BBC under World->National Networks->BBC. Or you can find them by browsing the UK, or searching for BBC. BBC Listen again content is still only available in Real, but you can access some programs on-demand or for download in the MP3 format.