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Other countries have begun to experiment with sugar taxes, with Mexico’s the most far reaching. Though set at 10%, public health experts recently reported that it is having an effect. Photograph: Bobbie Lerryn/Alamy Other countries have begun to experiment with sugar taxes, with Mexico’s the most far reaching. Though set at 10%, public health experts recently reported that it is having an effect.

The group of lads in the corner of the grungy Glaswegian bar aren’t your usual restaurant-goers. They’re honking with hilarity, phones clicking like dolphins. Who knows what’s causing the mirth – maybe the Buckfast ice-cream (notorious fortified wine, known locally as “Electric Soup”), or the burger topped with Smith’s bacon crisps, or the Irn-Bru pork. The “Mad Chef” at Bloc specialises in OTT fo

In a small army field-hut Dr Arjen de Vos shows off his irrigation machine with pride. Pipes lead out to several acres of muddy field, where only a few stragglers from the autumn harvest of potatoes, salads, carrots and onions are left. The tubes are lined with copper to stop corrosion because – in a move that defies everything we think we know about farming – de Vos is watering his plants with di