I found this listing in the 'Hornsey & Finsbury Park Journal' dated 3rd August 1917: “District Booking Offices have been opened at Messrs. Ashwell's, 28, The Market, Palmers Green; Mr. John Trapp, 9, Broadway Parade, Crouch End; and Mr. Lester James, 14, Pin Parade, Muswell Hill.”
“District Booking Offices have been opened at Messrs. Ashwell's, 28, The Market, Palmers Green; Mr. John Trapp, 9, Broadway Parade, Crouch End; and Mr. Lester James, 14, Pin Parade, Muswell Hill.”