Rogue French fridges were an unlikely talking point for the world’s leading economists, central bankers and finance chiefs meeting in a sultry Bangkok last week – helping to underline the spiralling cost of cyber-attacks.

Kristalina Georgieva, the managing director of the International Monetary Fund, seized on news that supermarket chains across France had to chuck out piles of spoiled food after hackers accessed their fridge controls and turned up the temperature to 50C.