Your browser is no longer supported

For the best possible experience using our website we recommend you upgrade to a newer version or another browser.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more


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 ...

Subscribe for full online access and get...

  • Full, instant access to all stories
  • Customised email alerts straight to your inbox
  • Monthly print magazine

Register for guest access to keep reading and get..

  • A free taste of other selected news stories
  • Daily email newsletters

Already have a subscription or ICE membership? or