"I'm a self-employed television script writer, sharing the care of two children and grossing about £300k."
*jaw drops to floor*
I am also a self-employed television script writer, sharing the care of two children. However the most I've ever made in a year is about a fifth of that, and more usually I make around twenty to twenty-five thousand a year. So not bad compared to my old job working in a bookshop, but not swanning about in a glass carriage money by any means. I suspect 'WireDuck' works in continuing drama (soaps), where the hunger for new scripts is insatiable, and being able to turn in decent scripts to tight deadlines is (rightly) highly rated.
Soaps aside, this isn't a great job for financial stability. One friend of mine made eighty grand one year, and eight the next, despite working equally hard on scripts both years. And the tax system isn't really set up to deal with that sort of fluctuation, so you always need as big an amount as you can manage put aside for scary bills from the year you were doing well, which always arrive in the year you're not doing so well.
Christ though. £300k!