Simon Calder, also known as The Man Who Pays His Way, has been writing about travel for The Independent since 1994. In his weekly opinion column, he explores a key travel issue – and what it means for you.
Beware of the triads. No, not organised crime syndicates; I mean the three wintry half-hours “with the highest electricity transmission system demand”. National Grid, which uses triads for pricing, says they typically occur on weekdays from November to February between 4.30pm and 6pm.
