Ciao Doreen,
It seems a little silly that with a whole TV program in the UK dedicated to their move to Tuscany the name of their farmhouse isn't that easy to find or identify. But I did manage to find it for you!
It is called Casa del Sole and their site is:
Casa del Sole
They don't offer accommodation - the farm sells organic olive oil and other products, breed Morgan horses and generally offer the service of their experience in moving to Tuscany.
Best regards