Can tactical voting apps help thwart Boris’s majority?

“Was Red Wedge pro-Labour, or did we just hate Tories?” asked musician Billy Bragg, when he launched his tactical vote site ‘Vote Dorset’ in 2001. He was trying to solve a problem British progressives have faced at every election since the re-emergence of the Liberals as a political force in the 1960s: while conservatives were united behind a single party, their forces were split between two or more.