There's been a lot of propaganda around recently in support of the Government's High Speed Rail plan (HS2) for London to Birmingham, and subsequently to Manchester and Leeds. A couple of weeks ago I saw a group of people with balloons and leaflets in Piccadilly Gardens, seeking to convince passers by to sign up to the scheme. Adverts can also be seen on the local buses. Is it the boon its supporters claim? Is it green? is it worth the cost?