More than 700 armed forces personnel will be involved in lining the route of the procession from Westminster to St Paul's, including three bands whose drums will be covered in black cloth.

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Now, even though refined plans show an alternate route, environmentalists worry that if the expected 500, 000 to 700, 000 barrels of crude oil flow through the pipeline each day, leaks could contaminate the water and soil.

CNN: STORY HIGHLIGHTS

More than 700 people have walked the length of the Roman structure since the full route opened in May - the first time it has been possible for 1, 600 years.

BBC: Roman trail proves hit with tourists