When the effects of fluctuating exchange rates are taken into account – known as 'constant currency' – revenue growth was 16.5 per cent.
PR and PA had the third biggest rise in constant currency revenue in the group, after advertising and media investment management (30.8 per cent constant currency) and branding and identity, healthcare and specialist communications (26.6 per cent constant currency).
Group-wide revenue rose 26 per cent in the third quarter to £1.3bn, up from £1.1bn last year – a rise of nearly 23 per cent after allowing for exchange rates.
Finance director Paul Richardson said growth had been primarily fuelled by strong group performance in Asia and the US, with more modest single digit growth in the UK and Europe.
The recent strength of the dollar and euro is believed to have caused the distortion between reported and constant currency revenues.