£500.00 a day!!!!!!!!!!!!
I would be happy to earn that a week, i must be doing something seriously wrong. 
I know a local window cleaner who has one day, every other month, where he can earn that amount.
But usually; nowhere near.
But I think if you live 'down South', have been window cleaning for a few years; work somewhere between 30 to 40 hours per week; £500 a week shouldn't be a problem; weather depending.
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To Neil100,
Wor Lass is running the Snowdon Marathon in September; she reckons it's something like the second toughest road marathon in Western Europe!
Fancy that? You sound like you could do it. I'll be there, egging her on; eating cheese-burgers and holding a can of lager, shouting, 'C'mon - faster - you lazy Taff'.
I'd like to see you there!
Next year she's planning to run a Mountain Marathon, but her map reading skills are non-exsistant; so a female friend (a quality female runner) is going to run with her.