We’re a week into the school summer holidays here in England, and I wonder how many parents who started out determined to keep their children completely away from screens are now beginning to feel the strain. When my sons were much younger, I often had these idyllic images in my head of day trips to the seaside, back garden treasure hunts, paddling in the river, visiting relatives … an endless series of character forming experiences which I imagined in grainy Kodachrome colours. Then I’d be faced with the reality of having a job, and also the, let’s say, limited attention...