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Series 8: 14th July - 13rd September 2010

The Dragons: Duncan Bannatyne, James Caan, Duncan Bannatyne, Peter Jones, Deborah Meaden, Theo Paphitis

Memorable entrepreneurs The current series has already had tears as single parent Kirsty Henshaw explained what drives her and colour as Angela Newman presented her retro chic. Exclusive to the website Radio 1's Dom Byrne has been roadtesting some of the Den-pitched products with members of the public. And on the Red Button you can hear more from the entrepreneurs who secured investment and from the Dragons, explaning their reasons why.

Series 7: 15th July - 2nd September 2009

The Dragons: Duncan Bannatyne, James Caan, Duncan Bannatyne, Peter Jones, Deborah Meaden, Theo Paphitis

Memorable entrepreneurs A series that got off to a flying start when multiple inventor and aviator Rupert Sweet-Escott secured investment. But it was Sharon Wright who, in an exemplary pitch, blew the Dragons away and secured more money than she came for.

Online: 1st April 2009 -

The Dragons: Julie Meyer and Shaf Rasul

Memorable entrepreneur With his football anthem for the 2010 World Cup, Warren Cole secured a deal with Julie Meyer as the Online Den (investments under £50,000) opened for business. Six TV programmes showcasing the best from Online was broadcast in autumn 2009.

Series 6: 21st July - 8th September 2008

The Dragons: Duncan Bannatyne, James Caan, Duncan Bannatyne, Peter Jones, Deborah Meaden, Theo Paphitis

Memorable entrepreneur One of the entrepreneurs not to gain investment was Natalie Ellis for her non-spill dog bowl. Since then she has proved the Dragons wrong. They predicted she wouldn't be able to crack the American market but she has - one happy customer happens to be President Obama.

Michael Cotton made history in the Den - the biggest investment to date, a cool £250,000 for his misfuelling prevention device.

Series 5: 15th October - 18th December 2007

The Dragons: Duncan Bannatyne, James Caan, Duncan Bannatyne, Peter Jones, Deborah Meaden, Theo Paphitis

Memorable entrepreneur Catching Deborah Meaden's eye in series 5 was Sarah Lu. Her You Doo Dolls, a brand creating novelty products that allow older children to personalise them, have proved more than a passing fad.

Series 4: 7th February - 21st March 2007

The Dragons: Duncan Bannatyne, Richard Farleigh, Peter Jones, Deborah Meaden, Theo Paphitis

Memorable entrepreneurs Among the entrepreneurs bringing razzamataz to series 4 was Denise Hutton, who came along with children from one of her chain of dance, drama and singing schools to woo the Dragons. It worked as Duncan Bannatyne pulled out his cheque-book.

Singing proved a hit in series 4 as Levi Roots was pitch perfect when he serenaded the Dragons and won investment for his home-made Reggae Reggae Sauce.

Series 3: 3rd August - 21st September 2006

The Dragons: Duncan Bannatyne, Richard Farleigh, Peter Jones, Deborah Meaden, Theo Paphitis

Memorable entrepreneur Among the ones that got away was Rob Law's hard plastic ride-on suitcase for kids, Trunki, and Peter Ashley's Easy X Chair, an arm chair multi-gym, which exhausted health club Dragon Duncan Bannatyne.

However James Seddon won investment despite the fact that he could not successfully demonstrate his water-free egg cooker in the Den.

Series 2: 15th November - 20th December 2005

The Dragons: Duncan Bannatyne, Rachel Elnaugh, Peter Jones, Theo Paphitis, Doug Richard

Memorable entrepreneur Clearly a high-wire act and one of the more eclectic decisions on the programme, Peter Jones and Theo Paphitis decided to invest in Paul Cockle's contemporary circus shows.

Series 1: 4th January - 8th February 2005

The Dragons: Duncan Bannatyne, Rachel Elnaugh, Peter Jones, Doug Richard, Simon Woodroffe

Memorable entrepreneur The first entrepreneur to enter the Den was Graham Whitby, with his Baby Dream Machine - a machine that rocks the pram or crib that a baby sleeps in. Graham walked away without investment.