It might bring in more revenue but there's still the capital outlay for the new buses and wages for twice as many bus drivers. It's not the fault of the buses that they were see as a free ride in London - they seem to operate OK in Germany. In Switzerland the trams and buses have more than one door and fare dodging doesn't appear to be such a huge problem. In any case, most of the people that bunk their fares on the 12 will still need to get from A to B so I am not sure that the change to double deckers will mean less congestion. I am sure the regular 12 commuters will find out tomorrow.