A flash lock is a type of lock for river or canal transport.
A drawing of a boat passing downstream through a flash lock
Capstan Wheel near Hurley, England that was used to winch boats upstream past a flash lock. It is said to be the only one left in England and was restored in 1999.
Blake's Lock is a lock situated on the River Kennet in Reading, Berkshire, England. It is on the short reach of the River Kennet which is administered as if it were part of the River Thames and is hence owned and managed by the Environment Agency.