The Government Says

Speed review: change of HS2 railway specification and scope

Speed review: change of HS2 railway specification and scope
Local copy of change-of-hs2-railway-specification-and-scope.pdf

https://www.gov.uk/government/publications/speed-review-change-of-hs2-railway-specification-and-scope

seen at 14:36, 19 May in Policy papers and consultations.