Actually, the intent of programmes like Panorama is to be critical and not, in this case, to be a PR promotion for HS2 . You will be pleased to learn your prediction was correct however. That, and normals, strangely, do take an interest in transport projects even more so in the case of the funding of this unwarranted white elephant and cash cow to be milked dry by construction companies.
" No link was made between the protests and MPs forcing route changes and tunnelling that added significant cost. The numbers used also appeared to lack the context of inflation, and they included the circa £35bn initial estimation that was slightly misleading as the act of parliament was not based on that number."
You must have missed the bit showing a collection of MP's outside Downing St, there to lobby for route changes away from their constituencies. That, and the reference to 11 miles of tunnels, under the Chilterns, plus, another 22 miles out of the total length...inflation was certainly mentioned as was the willingness of the Gov't to keep pouring money in. The reaction to the interview by a schoolboy to Boris, naturally, saying you just keep digging a deeper hole, was telling.