The FPB is calling for a reduction in the burden of legislation which for many firms is a barrier to growth, for a greater understanding of the impact of late payment and a reduction in the lower rate of corporation tax.

"Government regulation is making it harder for small businesses – the initiative to make politicians think smallest first is vital if they are to prosper and not disappear under a mountain of gold-plated red tape," said the Teignbridge MP.

On receiving the signed pledge, the FPB's Chief Executive, Phil Orford, said: "Richard Younger-Ross' signature adds even more momentum to our Think Smallest First campaign. Having an MP on board with his experience of running a small business should help in getting our message heard where it needs to be – Westminster."

The FPB's Think Smallest First campaign was launched in June 2008, and has gained cross-party support from MPs and Ministers. In June 2008, the FPB posted a petition on the Downing Street website, which now has more than 800 signatures from owners of small businesses and members of the public.

Mr Younger-Ross was elected in 2001 and is currently a Liberal Democrat Shadow Minister for Culture, Media and Sport. He sits on the European Scrutiny Committee and Foreign Affairs Select Committee. He is a member of the Howard League for Penal Reform and Anti-Slavery International.

Aside from politics, Mr Younger-Ross has worked mainly in architectural practices. In the 1980s he helped to run his father's insurance brokerage and the family store at Shepperton Film Studios. He has also worked as a political researcher in the House of Commons and spent 1982 working in Iraq.

Mr Younger-Ross is married, a keen rower and enjoys cooking. He is a fan of folk and blues music, as well as gardening.