Taxi-hailing apps like Uber have shaken up the market in cities around the world, and in some places established taxi drivers have clashed with the upstarts. In London, some drivers of the iconic black cab are taking the fight online, using the hashtag #ubered to try to woo unhappy Uber customers and to generally put the San Francisco start-up in a negative light. But are some going too far?

Reporter: This email address is being protected from spambots. You need JavaScript enabled to view it." class="story-body__link-email">Mike Wendling

Video journalist: Neil Meads

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