The thousands of companies involved in London's Olympics can now advertise their contribution, after restrictions were lifted.
The government has given 2-million pounds to the British Olympic Association to operate the new "supplier recognition scheme".
The association will license firms allowing them to highlight their work at trade shows.
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Pictures of today's events unfolding following a major security incident at the Houses of Parliament.
At least two people have died after a knifeman brought terror to the heart of Westminster.
The Cobra committee brings together government ministers with senior officials of the emergency services and security agencies.