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Valued at 拢80 billion, the UK's junior stock market is hyped as the most successful growth market in the world.

Government incentives - including stamp duty and inheritance tax breaks - mean that more ordinary UK investors are opting for the Alternative Investment Market (AIM).

Set up in 1995 to allow smaller companies to raise funds, AIM is a less-regulated alternative to its big brother, the main London Stock Exchange.

But it is no stranger to controversy.

Once labelled a "casino" by a senior US regulator due to its lax regulation, the market has been hit by a series of recent high profile scandals.

File on Four asks if this light-touch regulation poses a hidden risk for shareholders and if unscrupulous businesses are exploiting AIM to rip off ordinary British investors?

Producer: Alys Harte
Reporter: Simon Cox.