Google and Facebook are "making money hand over fist" and it's time they use some of that cash to sort the problem of ad fraud by a fixed date, according to The&Partnership founder and chief executive Johnny Hornby.

Britvic has announced that it will conduct a review of its lead creative agency roster as the soft drinks specialist seeks to streamline its agency support services. The Tango, Drench and 7-Up supplier is the largest purveyor of branded soft drinks in Britain, with its creative output overseen by three agencies; BBH, Iris and 101 London -- with the former having already decided it will not pitch.

Books sales in the UK rose 6% last year, buoyed by increased purchases of physical books. In the digital realm, ebook sales fell by 4%, but ecommerce expanded its share of the country's overall book business. According to Nielsen Book data, announced in time for the start of this week's London Book Fair, 2016's gain in overall book sales was helped by a 7% increase in physical sales.

M&C Saatchi's pre-tax profits fell 8.4% year-on-year to GBP6.5m in the year to 31 December 2016 in the UK. In the company's financial results published this morning, the UK business continued to be hit by "restructuring costs" of GBP1.6m in the ad agency last year. Operating profit also dropped 12% to GBP5.5m because of this.

Facebook's EMEA boss Nicola Mendelsohn says the social network is "striving to be the most open and transparent company" amid growing concerns about digital ad measurement and effectiveness. Mendelsohn used her speed at the Market Research Society's Impact conference to claim that "being open" is one of Facebook's five core pillars.

PSA Group is expected to consolidate its media business into a single group as it seeks a more consistent marketing approach. The French car company currently uses Havas and OMD for media planning and buying. Both agencies handle about ten markets each. Havas looks after France, Spain, Latin America and other markets. OMD oversees the UK, Germany and Italy.

The chief executive of Unilever has questioned whether the City's takeover code provides a level playing field for companies at risk of takeover. Paul Polman, whose Anglo-Dutch group rebuffed a GBP115 billion takeover approach from Kraft Heinz last month, said there needed to be easier and more flexible ways for companies to defend their performance.

Upday, the mobile news app owned by digital publishing powerhouse Axel Springer, will for the first time monetise its traffic programmatically through a partnership with Innex, Innerative's global mobile ad exchange. The personalised news app was developed by Axel Springer as part of an exclusive partnership with Samsung Electronics.

Channel 4's commercial division 4Sales has launched what it says is the first ever 360 interactive ad format on its video-on-demand platform, All 4. The broadcaster has signed up Honda and South African Tourism as the first brands to use the format, Ad 360, which was developed by tech partner Innovid. To experience the ads in 360, viewers drag their mouse to rotate the view on screen.

David Abraham will stand down as chief executive of Channel 4 after seven years. The broadcaster accidentally revealed Abraham's resignation when it prematurely tweeted a statement about his departure. The tweet was hastily deleted. However, Abraham's exit has been the subject of much speculation since late last year.