In 2012, Boris Johnson visited Ruislip to see Stop HS2 campaigners there. The benefit cost ratio has gone done since then, so given that the business case was doubtful then, it has got even worse since.
Report from ITV London News, Wed 11th Jan 2012
In the Greater Manchester marginal constituency of Bury North, its Conservative MP speaks out against HS2. http://davidnuttall.info/2013/11/03/hs2/