HS2 Ltd’s Main Works Contractor (MWC) in the area (EKFB) has produced a December Newsletter, summarising their current work and that planned for the early part of 2022. You will find the newsletter at HS2 Newsletter. Note that it covers the surface works between Great Missenden and Stoke Mandeville, but does not cover the work by the MWC building the tunnel from the south as far as Great Missenden (ALIGN). There is a similar update by ALIGN for the Chiltern North Portal at South Heath at North-Portal-Construction-Update-002-1.pdf (hs2.org.uk)