TOPSHOT - Campaigners with guide dogs pose outside number 10, Downing Street as they drop off a petiton following a pro-EU, anti-Brexit march calling for a "People's Vote on Brexit", in central London on October 7, 2018. - Britain voted narrowly to leave the EU in a divisive 2016 referendum and is set to leave in March next year. The main force calling for a second referendum is the cross-party People's Vote campaign -- the successor of the official Remain campaign from the 2016 referendum. (Photo by Tolga AKMEN / AFP)