The survey of 110 event organisers, carried out by Center Parcs, revealed that 85% of the respondents to the survey who have in the past hosted summer events in the capital would move their events outside the capital.
Of the overall respondents, 42% regularly host events in London; with a further 40% of these London events taking place during the summer months.
Around 15% of those who plan meetings, conferences and events in the capital said they would postpone any activity to later in the year.
More than half (58%) cited an increase in costs as their reason for hosting events outside of London and 17% indicated the transport issues as their reason for migrating their meetings and events.
Ian Linley, head of corporate sales at Center Parcs, said the research "clearly underlines the huge opportunity for venues outside the capital’s perimeter to benefit from the displacement of business events from London."