Scientists in the UK have achieved the fastest ever broadband speeds of 1.4 terabits per second, enough to transmit 44 high-definition movies at once.The British Telecom and a French networking equipment company jointly tested the high speeds of 1.4 terabits per second on the existing fibre network in London.The breakthrough is being seen as highly important for internet service providers, as it means a greater amount of information can be sent through existing broadband infrastructure, reducing the need for costly upgrades.