I give you £500,000 and you have exactly one year to double my money. That's £1,000,000!
How would you make this happen? Would you invest in the property market. Start a business or invent something. Maybe you'd make money buying and selling antiques or old cars, or maybe you'd just sit back and gamble it all away. 500,000 scratch cards would take a long time to scratch but you could get lucky. Be warned though, if you don't double my money within a year...