Global brands including Volkswagen, Toyota and Tesco last night joined the more than 250 companies that have suspended advertising deals with Google as the internet giant apologised for failing to crack down on extremism.

ITV, Aviva and Heinz also pulled advertising from YouTube, Google's video platform, after an investigation by The Times found the companies promoted on videos posted by hate preachers, rape apologists and homophobic extremists banned from entering Britain.

A growing number of brands have blocked Google or YouTube advertising since the revelations last week.