We left prepared. Bottles of water, protein snacks, phone chargers, portable Scrabble (even the teenagers can look at the internet for only so long). And we left early: our crossing was at 2 p.m., and by 9 a.m. we were already on the M25. Six-hour queues, we’d been warned. Armageddon on the M2. Somewhere around Maidstone, I got a text. P&O Ferries: ‘We regret our sailings are delayed by up to 45 minutes.’ Uh-oh. But as we descended into Dover, zero sign of trouble. We sailed through check-in. ‘So sorry there’s a bit of a delay,’ said the man in the booth. No worries, said we, pathetically grateful not to be stuck in a lorry park. On to French customs. Again, not a queue in sight. ‘Bonjour,’ I said, in my best Franglais, handing over our passports.