Alice Enders, at Enders Analysis, said the fact that English is such a global language will always keep the UK on the front foot.
She added: 'There is also a pool of educated young people who have all the right skillsets.'
But Enders emphasised that the data is more complicated than it first appears as the Office for National Statistics does not provide a detailed breakdown. As well as direct ad sales, it includes conferences and events, making it more difficult to gauge the impact of specific parts of the industry.
