They were created by Iris, a London-based creative agency.

"Private publishers are doing an extremely valuable job," says Andrew Nurnberg, whose London-based literary agency specializes in foreign rights.

It is published by London-based creative agency The Church of London.

It is not known how much the stake cost the Kuwait Investment Office, the London-based agency that manages the Persian Gulf state's international investments.

The article also said that Young & Rubicam might also be talking to other London-based agencies about similar alliances.

"Martin is a controversial figure here," said a senior executive at a major London-based agency.

However, the most important spenders are clients who most frequently use London-based agencies.

It is published by London-based creative agency The Church of London who also publish Huck Magazine.

"There will be a change for a little while in the newspapers," said Christine Cornick, features editor of Alpha, a London-based photographic agency.

Collective is an independently owned London-based digital creative agency specialising in internet marketing, and best known for its work for Honda.