WPP boss Sir Martin Sorrell speaking at the PRCA and CorpComms Conference in London today spotlighted the issue that all marketing agencies face: pitching for free.

“The RFP process is still a long process and it’s all for free. WPP has participated in a pitch for a piece of work recently invoicing four major groups all for [no cost to the prospect] and in one global pitch recently we delivered a 36,000 page document,” he said.

But Sorrell said the situation is unlikely to ever change due to over capacity in agency land.

“There will always be competitors that are prepared to [pitch] for free,” he said.