It could be a storming year. He's expecting his summer truffle trees to yield between 70kg and 230kg a hectare and sell for around €280 (£249) per kilo (the current price is €400 per kilo but this varies during the year). The more delicate black truffles have a lower yield but sell for four to five times that price. "People have been growing truffles in the UK for close to 40 years. What we have done is bring the technology up to date, making it more reliable," says Thomas.