The M25, as much a feature of the capital as Wembley's arch, the London Eye or Tower Bridge, has reached the milestone of being operational for 30 years. Officially opened by Margaret Thatcher on 29 October 1986, the 117-mile stretch of road has catered for the needs of millions of commuters, holidaymakers and hauliers for three decades. Spanning five counties - Kent, Surrey, Buckinghamshire, Hertfordshire and Essex -and encircling all of Greater London (with the exception of North Ockendon), it is Europe's second-longest orbital road, coming in behind only the Berliner Ring, which is 122 miles long.
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