Question follow-through · 11820
High Speed 2 Line: Tunnels
To ask the Secretary of State for Transport, with reference to the HS2 six-monthly report to Parliament published in May 2026, what lessons learned and innovative construction methods were deployed in the completion of the north portal structure at the Ch
About this written question
A written question asks a government minister for information in writing. Parliament publishes the question and any answer.
- Answering body
- Department for Transport
- Tabled
- 22 Jun 2026
- Target answer date
- 29 Jun 2026
- Answer
- 1 Jul 2026 · 9 calendar days after tabling
Elapsed calendar days describe the record timeline, not whether Parliament considers an answer on time.
More questions by this MP on Democracy and constitution
- South West Main Line: Standards · 23 Jun 2026
Shared topic keywords suggest a connection; they do not establish a follow-up.
Recorded timeline
22 Jun 2026
Question tabled
To ask the Secretary of State for Transport, with reference to the HS2 six-monthly report to Parliament published in May 2026, what lessons learned and innovative construction methods were deployed in the completion of the north portal structure at the Ch
29 Jun 2026
Target answer date
Date supplied by the official written-questions record.
1 Jul 2026
Answer published
The Chiltern Tunnel North and South Portals have been specially engineered with perforated concrete hoods to prevent the possibility of sudden changes in air pressure and a resulting ‘sonic boom’ caused by trains entering and exiting the 10-mile-long tunn...
Official data retrieved 28 Sept 2026.
Later records
Possible follow-up questions
Strong links require the same MP, department and exact heading. Other same-department questions are shown as unreviewed candidates, not as confirmed follow-ups. No debate link is asserted unless a stable source relationship exists.
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