Companies pay to have their websites linked to particular terms on Google - one of the world's top search engines.

Thomson, Thomas Cook and First Choice were said to have acted after rival companies linked their websites to the names of the market leaders.

Google said such practices were stopped if trademarks were "used incorrectly".

"As stated in our Terms and Conditions, advertisers themselves are responsible for the keywords and ad text that they choose to use," Google said

"However, as a courtesy to trademark owners, Google will perform a limited investigation of reasonable complaints."

Google said if an advertiser uses a trademarked term as a "keyword trigger", those words would be taken out of its campaign.

Get the full story at BBC News