No, he was not winding you up, John.
Pine Martens like sweet things (though I have used cheap raspberry jam) so jam sandwiches go down well. They will also eat peanuts. Where they are being fed seeing them is easy. They learn quickly and regularly visit places where food is provided.
Seeing them in the wild is something else, I think. I've been fortunate to have visited NW Scotland about 4 or 5 times a year for the last 10 years and have seen one Pine Marten in the wild - ie not in a place where food is provided.
You could ask around the area where you are staying but be aware some folks do not like Pine Martens.
Dave