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GOING DOWN

The first shaft was completed last week on the longest tunnel project to be built in the UK since the London Ring Main. The 10m diameter shaft at St Johns Wood in London is the first of seven similar structures on the National Grid's London Connection project. The 20km tunnel will link St Johns Wood to Elstree and carry 400kV electricity power lines. Contracts for the main tunnelling works will be awarded by October from a shortlist of Amey, Amec, Miller and Murphy. Construction of ...

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