Solution to Round Robin XIII

 Solution to Round Robin XIII

The theme of Round Robin XIII is prime ministers of the UK and celebrates 300 years since ROBERT WALPOLE became the first in April 1721. (300 appears in larger print in the title.) The letters given in the preamble had to replace letters in the grid to form ROBERT WALPOLE and the surnames of 11 other PMs. As a hint, circled letters in the grid can be arranged to form a 13th – DISRAELI.