No it is not. Although Greater London is mostly within the M25, parts of other Counties bordering Greater London (known as the Home Counties) are also within the M25, the largest is a portion of the County of Surrey.
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North Ockendon is the only inhabited area in Greater London outside the M25 London Orbital Motorway. North Ockendon is north of South Ockendon, in Thurrock, Essex.
Junctions and servicesThe M25 has been criticised for having too many junctions; 14 of them serve only local roads. In 2016, Edmund King, president of the Automobile Association, attributed congestion on the M25 to excessive junctions.
Runnymede Bridge is a motorway, A-road, pedestrian, and cycle bridge, built in the 1960s and 1980s and expanded in the 2000s, carrying the M25 and A30 across the River Thames near the uppermost end of the Staines upon Thames and Egham reach of the river.
M25 and A282Officially named the London Orbital, nicknamed the 'Road to Hell', and frequently derided as nothing more than a very big car park, this is the world famous and rightly notorious M25.
The issue at hand is a simple one. Between junctions 10 and 11 on the M25, the surface of the motorway consists of concrete blocks. The concrete surface itself is noisy, and there are gaps between each of the concrete blocks that constitute the road.