My mistake, that would be Suffolk, not Sussex. My dad visited Mr. Hearne there eight or ten years ago, and he was alive as of May 2010.
Here is the contact information for his farm:
Capel Organic Mushrooms
Churchford Grange
Capel St Mary
Ipswich
Suffolk
Telephone: (01473) 310380
E-mail:
info@capelmushrooms.co.uk