Question to the Department for Transport:

To ask His Majesty's Government what is the percentage completion of construction in respect of HS2 Phase 1 of (1) Euston Tunnel, (2) Northolt Tunnel, (3) Chiltern Tunnel, (4) Long Itchington Wood Tunnel, (5) Bromford Tunnel, and (6) cut and cover tunnels.

Five tunnel boring machines (TBMs) have been launched to date. On HS2’s longest tunnel, the Chiltern Tunnel, both TBMs ‘Florence’ and ‘Cecilia’ have passed the Amersham vent shaft and are now more than 5-and-a-half miles into their 10 mile drive. In Warwickshire, HS2 completed the first tunnel bore under Long Itchington Wood in July 2022 and the TBM ‘Dorothy’ has been relaunched for the second tunnel bore. In West London, two TBMs ‘Sushila’ and ‘Caroline’ were launched in October 2022 from West Ruislip to create the first section of HS2 tunnel in London. The progress of TBMs can be tracked on the HS2 website.