The Dartford Crossing is owned by the UK Government. Highways England manages the crossing on behalf of the Department for Transport.
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Despite all the hype, the M25 isn't even a full circle. The Dartford Crossing (comprising the Dartford Tunnels and the Queen Elizabeth II Bridge) over the Thames in the east and its approach roads are designated A282, because the first Tunnel was built in the 1960s as a local connection.
Two tunnels and a bridge have been constructed at Dartford to allow people cross the River Thames. When work on the crossings took place in the 1950s a lot of workers suffered daily from decompression sickness, also known as 'The Bends'.