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Last Updated: Friday September 18 2009 16:44 GMT

City creates its own local cash

When you fly off on holiday abroad, you'll know you need to change your cash to a different currency.

But now kids in a part of south London are getting to grips with a whole new type of money, a lot closer to home.

Leah's went along to find out what's different about the way they're splashing the cash...