Mike Leigh’s brilliant 1976 Dorset-based comedy Nuts in May begins with Keith and Candice-Marie taking the chain ferry from Sandbanks across the mouth of Poole harbour to the Isle of Purbeck, where they camp, visit Corfe Castle, walk along the mighty Jurassic coastline and end up in an altercation with a young Brummie couple called Finger and Honky. For me, watching Nuts in May is an annual tradition, as is visiting the peninsula where it was filmed. Most of us have places for which we feel a particularly strong pull; one of mine is Purbeck. And since this peninsula’s recent status as England’s first “super” nature reserve, I’m beginning to understand why.