I assume this is the entry for your grandfather in the GRO death indexes;
Deaths Mar 1964
RICKARD JOHN G H 77 NEWTON A. 7A 565

As the death was registered in Newton Abbot I would contact the Cemetery Office at Teignbridge District Council to see if he is buried in one of their cemeteries. Contact number is 01626 215850.

If that fails try Torquay Crematorium (the nearest crematorium to Newton Abbot)to see if he was cremated there. Contact number is 01803 327768.