Plotting process motorists at the yard. With the monster 'Save the Basic Petrol Ration' demonstration scheduled to take place in Hyde Park at noon today (Thursday), Scotland Yard is having its busiest day for some time plotting the course of the thousands of motorists converging on London from all directions . Special routes into London, have been fixed by the police for the occasion, but they keep taking no chances and keeping a check to see the roads did not become blocked. 10 protest meetings are planned to be held in the Park, and later six representatives of the motorists will present a petition to the Minister of Fuel. Photo shows, the traffic control room at the Yard showing PC King speaking over the R/T with PC Whitehead, watching the map as they plot the movement of the expected 10,000 vehicles as they enter London. 23 October 1947