If you look at the current, August 2016, Google Maps Street View for Port Gaverne, Port Isaac PL29 3SH you will see the film trucks, equipment and setup for the barbecue scene near the end.
Martin Clunes and Caroline Quentin previously appeared together in British Men Behaving Badly (1992) as a couple.
Martin calls for the next patient, Lianne Perrins (Lea and Perrins).
Caroline Quentin (Angela Sim) and Martin Clunes (DocMartin) have been friends for 20 plus years and share a love of dogs.
Martin Clunes (Dr. Martin Ellingham) & Caroline Quentin (Angela Sim) also worked together on British Men Behaving Badly (1992) as Gary & Dorothy respectively.