Sandy could be ok, depends on the pH of the soil.
If you search youtube then theres lots of videos on people finding them in the UK. This will be my first year hunting them as i've got a dog thats up to the job now, but i've been interested in them for years. Honestly though, its definately worth trying especially if your into your mushrooms, they can be found in more places than you'd think. And its the Black Summer Truffle (Tuber aestivum) that is found in the UK