Few years ago local car main dealers would flog off all the old banger trade in's for next to nothing. You could pick up something like a corsa covered in crud and needing some tlc for £200 and with a good day cleaning have a car worth £500 - £700.

Many would only have a short mot so sometimes a gamble but bought cheap enough could easily turn a profit.

At your age doing it as a little earner you would only need to clear £100 profit per car and do two a month, would bring in as much as working all weekend in a shop.

If the scrapage scheme means the dealers don't sell the old trade in off, then look in your local paper and gumtree, people always flogging of old bangers, buy up the ones that are grubby and looking sorry for themselves, but mechanically good with some mot and tax.

Haggle the seller down, get it home, make it look all pretty and then stick it on pistonheads with some profit in it. - even try and get the owner to drop it off for you if you in the same town/city

Some you'll do ok with, some you wont, all down to what you buy and at what price - the key is buying cars that will appeal to all as these will be easier to sell.