There seems no end to the range of specialised restaurants on offer. The latest thing we’ve seen is  a broth restaurant opened by fine dining chef Marco Canora in New York. Broth is something you might more typically associate with convalescence but the popularity of eating plans like The Paleo diet is giving the concoction something of a lift.

If you’re interested in going into the fast food business, it’s worth pausing for a moment and thinking beyond the obvious of burgers, pizza and the like. There could be a lucrative opportunity to do something really different.