The competition, jointly run with the Marketing Agencies Association, is open to all start-ups that have traded for less than two years. It involves pitching their business in four minutes to a panel of agency judges, who will then make a play for those they wish to work with.
If more than one agency shows an interest, the 'Dragon’s Den'-style event will then see the agencies making their pitch as to why the start-up should choose them.
StartUp Britain is now calling for entries to 'Marketing 4 StartUp Britain', with the one-day event to be held in London on 22 January.
Last year, nine entrepreneurial brands, out of 113 entries, won free marketing support, including The Cambridge Raincoat Company working with Arc, and Ablejourneys.com, a holiday company tailoring services to the disabled or older people, working with Saatchi & Saatchi X.
"Input from a top marketing agency at an early stage can be transformative for a small business," said StartUp Britain co-founder Emma Jones. "This initiative with the MAA offers ambitious start-ups a chance to get the kind of expert advice that’s beyond their wildest dreams – and it can set them on a clear trajectory for success."
Ian Millner, chairman of the MAA, added that it was vital for agencies to play a part in the regeneration of the British economy.