Related Clues:

• Number of vehicles
• Fast kind of armada?
• Fast as a group of ships
• Group of ships
• Naval force or collection of buses
• The British Government or London street
• Group of vehicles operating together, ships say
• Halt while we find British Government
• Swift like navy
• Group of aircraft, ships etc
• Site of the British civil service
• Group of aircraft, ships or cars
• Swift like naval force
• Group of ships, aircraft etc
• Fast with 15 acrosses