Truffles are underground mushrooms and are considered to be the ultimate gastronomic experience. The hazelnut trees have had their roots impregnated with the truffle spores, and the varieties chosen are both indigenous (native) and suitable for growing here (the black summer truffle is also called the English truffle!!).
Other varieties like the very expensive White pregiato Alba truffle are very unlikely to grow here, which is why they are very expensive - they will only grow in Alba in Piemonte and Aqualagna in Umbria. Use freshly sliced on a variety of dishes, with pasta, risotto, polenta, eggs and potatoes, to flavour olive oil, marscarpone cheese or parmesan, and to freeze. There are producing truffle farms all over Europe, and newer ones in the USA & UK. Truffle prices reached record prices in 2003 due to a lack of availability, despite the fact there are over 100,000 registered truffle hunters in Italy !! There are probably as many truffles in the UK as Italy, but no-one really goes looking for them here and there are no truffle dogs, although there are 4 producing truffle farms!!