Some 36 per cent of agencies have seen their international business increase over the past five years, with eight per cent of agencies saying that between 91 and 100 per cent of their business is currently internationally focused.
The survey of the PRCA PR Leaders' Panel shows only 17 per cent don't have any revenues at all from international PR.
PRCA director general Francis Ingham said: 'With 25 per cent of respondents saying that 21 to 30 per cent of their business came from international projects directed and managed from this country, we can truly say that the UK is the international hub for PR.'
Salt director Andrew Last said: 'Apart from the language and time zone benefits of being based in the UK, the prime driver for this is the respect in which UK PR expertise is held around the world.'
The PRCA PR Leaders' Panel is made up of managing directors of members of the PRCA.