The Government is subsidising the passenger, rather than taking financial responsibility for the service. If there aren't enough passengers paying £2 (+ receiving the 'make-up') then the bus company can withdraw or amend at their commercial will. Not quite the same.Can a bus service be said to be "commercially" run if its being subsidised by the £2 scheme ? Don't get me wrong, it's a good idea, but it's still a subsidy.
With regard to fares fare, I'm sure even true blue Bromley has bus services.
The immediate issue for Bromley was that the supplementary rate demand was the same whether the Borough had Underground service or not - all of the Boroughs had buses with cheaper fares but only some had Underground with cheaper fares. [Main Line rail fares were unchanged] . Therefore there was a perception that this was unfair (it being a long ride by bus from Bromley to Central London] . There was also ulterior political motive too, but this flaw was open to exploitation, and it is difficult not to have some sympathy with the argument.