Plug it into your computer, update to the latest possible software version, then find an app in the app store that'll do it.
Three years ago, it'll be a 1st gen. The latest version of the software it can use is 3.1.3 (which is necessary for a lot of apps to work), which will cost you a few dollars through the iTunes Store if you don't already have it installed.
if you bought it 3 years ago it's a 1st gen. as far as being able to listen to the BBC you should be able to, a quick search on google came up with this page, but I;m sure there are other ways as well.