asked for the total population of the Island of Canna, and who is the panel doctor for that island?

The nearest doctor is on the island of Eigg. The total resident population of the Island of Canna, as shown by the last census, was twenty-nine.

Who is the panel doctor for these twenty-nine persons?

There are not twenty-nine; I do not think there are anything like twenty-nine insured persons.

Are these insured persons entitled to a doctor?

They are certainly entitled to have a doctor, or the equivalent cost of a doctor.