Boom in meat and dairy substitutes sets up 'battle for the centre of the plate'.

First came the vegetarians, then the vegans, followed by a bewildering array of food tribes from veggievores, flexitarians and meat reducers to pescatarians and lacto-vegetarians.

If the profusion of terms for people who have cut their meat or dairy intake is anything to go by, a change is afoot that is set to sweep through the global food industry as once-niche dietary movements join the mainstream.

Fast-food chain Burger King has partnered with a "foodtech" start-up, and McDonald's with Nestlé, to put meat-free burgers on their