The Government could be accused of giving brands undue influence on policy by allowing exclusive sponsorship of its campaigns, ad industry executives warn.
Larger PR agencies are winning digital business from specialist shops as they strengthen their in-house expertise, according to industry research.
UK adspend topped £17 billion last year for the first time since the start of the downturn, according to the Advertising Association and Warc's quarterly Expenditure Report.
MediaCom, ZenithOptimedia and ITN are among eight businesses to sign up to GoThinkBig, the work experience scheme from O2 and Bauer Media.
WPP has reported UK revenues rose by 11.9% to £318m in Q1, despite what the chief executive Martin Sorrell described as "hand-to-hand combat in the trenches" in the wider communications market.
WPP's first quarter PR and public affairs revenues have dropped 1.4 per cent year on year to £221m.
International PR group Next Fifteen, which today unveiled half-year profits of £4.5m, is planning a two-year restructuring and investment programme to meet the pace of clients' adoption of digital marketing services.
Omnicom, the owner of the BBDO and OMD networks, reported pre-tax profits of $331m (£216m) in the first quarter of 2013, down 0.8% year on year, despite revenue rising by almost 3%.
Worldwide advertising spend rose 3.2 per cent to $557 billion (£362 billion) last year, despite advertisers in Europe tightening their belts, after spend increased in the TV, internet, radio, outdoor and cinema sectors.
PR professionals are among the worst offenders for exploiting interns, according to research by campaign group Intern Aware.