The road connections between Kent and Essex are notorious for being subject to heavy traffic and long delays - particularly the Dartford Crossing. At Tilbury, you have the alternative of crossing the River Thames by boat, with a regular ferry service running to Gravesend.
In the 1980s, the service was threatened with closure due to low usage. But it survived to the present day. How much has the sound of the River Thames changed in those 30 years?