A Minister has to reply.
The wording of the Petition which received 155,000 signatures is:
“We ask Parliament to repeal the High-Speed Rail Bills, 2016 and 2019, as MPs voted on misleading environmental, financial and timetable information provided by the Dept of Transport and HS2 Ltd. It fails to address the conditions of the Paris Accord and costs have risen from £56bn to over £100bn.”
Here is the basic link to Monday’s Agenda for the Westminster Hall debate
See here for details of how HS2 was proceeded with to protect the UK construction industry.