ITV's advertising revenue fell eight per cent in the third quarter — worse than the five per cent decline the broadcaster itself had forecast — as the company announced £30m in fresh cuts and its £1.6bn sale to Sky entered a government investigation.

The FTSE 250 broadcaster said on Wednesday that economic uncertainty and competition from global streaming platforms had weakened demand. The miss matters because ITV had already guided the market lower; conditions deteriorated beyond its own pessimism.

What does this change for the advertising market?

ITV now expects a five to ten per cent advertising decline in the fourth quarter, bringing the full-year drop to between two and three per cent. Chief executive Dame Carolyn McCall blamed three factors: economic uncertainty, global streaming competition, and restrictions on advertising of less healthy food.

"We are taking decisive action, aligning our investment with advertiser demand to deliver additional temporary content and discretionary non-content cost savings in Q4," McCall said. The word "temporary" carries weight here; ITV has not said what happens if the downturn proves permanent.

The savings are concrete, at least. ITV will cut £25m from its fourth-quarter programming budget and a further £5m in discretionary spending. That is £30m in total — but it comes partly from making fewer programmes, which risks weakening the very content that attracts advertisers.

How deep does the revenue decline run?

Group revenue slipped one per cent to £2.76bn in the nine months to September. External revenue (income from outside the company's own divisions) fell two per cent to £2.36bn.

• Media and entertainment division, which Sky is set to acquire: down one per cent to £1.43bn
• ITV Studios, which will remain independently listed after the sale: down one per cent to £1.33bn

McCall maintained that ITV Studios remains on track for full-year growth. She offered no detailed reconciliation of how a division down year-to-date will turn positive by December; the claim rests on an unquantified fourth-quarter performance.

Why is the Sky deal under investigation?

Culture secretary Lisa Nandy issued a public interest intervention notice on 4 November, instructing Ofcom (the UK's media regulator) and the Competition and Markets Authority to investigate the transaction. Their reports are due by 27 January.

The intervention came a week before Wednesday's trading update. Nandy has raised concerns that the combined broadcasters would account for around 86 per cent of linear news and current affairs viewing in Britain — a concentration few markets would tolerate without scrutiny. She has also flagged potential US political influence on editorial independence, a pointed question given that Sky's owner, Comcast, is American.

ITV reiterated that the £1.6bn sale remains on track to complete in the second half of 2027. McCall described the intervention as an "expected and important milestone", adding that the process was "moving at pace". Calling a regulatory intervention a milestone is standard deal rhetoric; it does not predict the regulators' verdict.

Sky chief executive Dana Strong defended the deal this week, arguing it would strengthen British broadcasters against global streaming rivals. Sky has pledged to preserve ITV's free-to-air channels, public service commitments and the editorial independence of ITV News.

What does this change for ITV shareholders?

Pledges, however, are not yet enforceable commitments. Whether Ofcom and the CMA choose to bind them — through remedies or conditions — will shape what Sky is actually buying, and at what regulatory price. Until 27 January, both companies are arguing their case against numbers that keep moving in the wrong direction: advertising down eight per cent, revenue down across both divisions, and a cost-cutting programme that trims £30m in a single quarter.