The back roads to Royal Cornwall Show, past Ruthernbridge and Lanivet are magical, meandering and lined with wildflowers. They seem which materialise once a year for the annual family day out. There are landmarks like the farm with bright blue gates and the shaded valley garden filled with gunnera. Tim and I are joined by Saskia (2), Bathsheba (7) and Tristan (14) for the trip. Tim’s Dad (like many Cornish farmers) is there too, as a steward, resplendent in his bowler hat and suit.