is the HS2 heathrow spur the right route?

One problem with the current HS2 design is that the later stage Heathrow spur may have to cross asbestos deposits f those fields with it near Yiewsley reach further west than the ones already exploited in Cowley for the building of post war prefab housing and some forms of brick mortar before that. As such it is a construction challenge and one for the engineeers.