How much pocket money do you give your kids?

[Snatch1]

I've got 2 boys, 6 & 9. They don't currently get a set amount of pocket money weekly, instead they get bought sweets, comics etc on an adhoc basis. I'd like to start giving them regular pocket money in exchange for doing things like keeping their rooms tidy, washing the cars with me, mowing the lawn etc. I think it would be a useful exercise in teaching them the value of money and how to save/budget for things they'd like to buy.

I'm wondering what the going rate is and thinking of starting with £5 for the 9 y/o, £3.50 for the 6 y/o. Any other thoughts in regards to them saving a percentage etc?

[Snatch1]

Weekly. And yes it would be purely for non-essentials. I wouldn't expect them to have to buy their own clothes, pay for sports club fees, swimming lessons etc just yet!