Roasting a whole chicken used to be a Sunday-afternoon commitment: an hour-plus in the oven, a hot kitchen, and a big energy bill. The air fryer turns it into a weeknight job. A small whole chicken roasts in under an hour with crackling-crisp skin and juicy meat, and one bird can anchor an entire week of air fryer whole chicken meal prep — Sunday roast vibes on Sunday, shredded chicken salads, wraps and soups for days after. Whole chickens are also one of the best-value proteins in the supermarket. At typically £3.50 to £5.00 for a 1.5kg bird (estimate), the cost per portion beats almost any other meat, and you…