Figures unearthed as part of PRWeek’s ‘State of the Public Sector’ series revealed that spending in PR is expected to double this year to £120,000.
The news comes as the city and Johnson were both roundly praised for their role in a Games that drew the attention of the world’s media.
The rise follows on from cuts in PR spend that saw budgets fall from nearly £247,000 in 2007-08 to £62,000 last year.
A spokeswoman for the GLA said the trend reflected the fact that much of the spending was on media monitoring, with the service outsourced in 2010 to Precise amid a drive to ‘make considerable savings’.
‘When the Mayor was elected, it was his priority to create a more efficient GLA, which delivered better value for money for London taxpayers,’ she added.
The figures revealed that PR spending fitted within a wider trend that saw overall comms and marketing drop from £581,000 in 2007-08 to £267,000, before going up to a predicted £356,000 for 2012-13.
Staffing numbers have also increased across the in-house comms team in the past year, from 23 to 27, with the marketing team doubled from four to eight.
However, the slash in ad spend has continued, with a budget of more than £1m in 2007-08 down to a predicted £65,000 for 2012/13.
It has also been revealed that former director of comms Guto Harri, who left to join News International in May, was paid £128,000 in his GLA role.