The completion and sale of high speed 1 report by the comptroller and 3 then known as the department of transport 4 comptroller and auditor general the channel tunnel rail link session 2000 01 hc 302 national audit office march 2001 5 comptroller and auditor general progress on the channel tunnel rail link session 2005 06 hc 77 national audit office july 2005 6 summary the . Full report the completion and sale of high speed 1 the national audit office has today published a report on the construction and sale of the high speed railway line linking the channel tunnel with central london the high speed 1 project has delivered a high performing line which was subsequently sold in a well managed way which removed the taxpayers open ended support for the project . Office july 2005 6 summary the full report the completion and sale of high speed 1 the national audit office has today published a report on the construction and sale of the high speed railway line linking the channel tunnel with central london the high speed 1 project has delivered a high performing line which was subsequently sold in a well. Tunnel with central london the high speed 1 project has delivered a high performing line which was subsequently sold in a well managed way which removed the taxpayers open ended support for the project the completion and sale of high speed 1 report by the comptroller and 3 then known as the department of transport 4 comptroller and. Office july 2005 6 summary the full report the completion and sale of high speed 1 the national audit office has today published a report on the construction and sale of the high speed railway line linking the channel tunnel with central london the high speed 1 project has delivered a high performing line which was subsequently sold in a well