The social centre of the British Isles

If you've ever tried to search Twitter for UK-related tweets, you'll know that the 'within xx km of place y' location functionality is a bit of a pain - even if you can run English-language only searches. I'm currently demo-ing a few brand tracking packages, and realised that if I'm paying for them then I'm going to have to do a bit more work on the actual location that I should be searching. So here it is: the geographic centre of the British Isles: Whitehaven. (or if you are using ViralHeat then Whitehaven, Cumbria, UK.The circle has a radius of 500km, and neatly covers the UK & Ireland.