US Lists showing by default in UK

At the start of the year I had British lists popping up on my homepage, but now it's defaulted to the American lists! Any idea why it's changed and how I can change it back?

You can actually choose favourite lists you want to display on your home page: [url] bubo.org/your-personal-home-page.html [/url].

If you aren't logged in, or have no favourites set up, then we try to work out where you are (from IP address) and show lists from that country, but this isn't always foolproof, partly because we use a less accurate database for this rather than pay for better!
 

OK that figures - I am logged in but didn't know I could choose favourites. Thanks!