Another source of radio information in the UK are the ratings. www.rajar.co.uk - they make public their headline numbers, just as Nielsen does here. I bet some stations around here would kill for the numbers some UK stations get. BBC Radio 2 has about a 17% share - nationwide. My university city (Dundee, in Scotland ) - when you take the two main station's AM and FM numbers combined, you get over a 30% share and the AM accounts for over a third of that.