Ooni Fyra 12 Portable Outdoor Pizza Oven (£299)
While this is a little on the pricey side, it's the gift that will provide so much enjoyment throughout the year. If your Dad is always pottering around in the garden, then club together to buy this pizza oven. It cooks them in just 60 seconds, so will be the focus of your summer. If he's already the barbecue king, then add pizzas to his repertoire, too. This one is lightweight and has foldable legs.