We watched a Coast programme that evening (presented by that handsome scottish bloke with the hair), and it turned out that they were able to scientifically prove that the light IS special at St Ives. Apparently it's down to a combination of little pollution, being surrounded by the sea, and the very pale sand which reflects the light. So that's why all the painters flock there.
I am seriously considering becoming an MP, just so that I can get a second home down at St Ives, paid for by the tax payers. Trouble is, everyone says I'm a nice, honest person, and therefore I'm unlikely to be suitable.