Related Clues:

• Subterranean river in London
• Warship contingent
• Fast water under London
• Company cars, as a group
• British journalist's street, once
• Naval battle group
• Fast walkers rounding lake?
• Fast naval force
• Thrice: "Burn the ___"
• Big tour-bus armada
• Collection of cars/ships
• Fast in prison
• Large naval force
• Fast — naval force
• “At the present moment, the whole ____’s lit up. When I say ‘lit up’ I mean lit up by fairy lamps” (Lieutenant-Commander Thomas Woodrooffe, in a notorious radio broadcast)