As a result of the consultation additional work was undertaken and a package of alterations to the proposed route has been adopted. These alterations include substantial additional tunnelling in the Chilterns and in Ruislip, which will reduce the impact of the high speed rail line on the local environment and communities. The mitigation measures will mean that more than half of the route will be in tunnel or cutting.

• Summary of effects of HS2 London to West Midlands route refinements
• Review of possible refinements to the proposed HS2 London to West Midlands route
• Review of HS2 London to West Midlands route selection and speed
• Review of HS2 London to West Midlands appraisal of sustainability