The bus operators are going to have to deal with this problem (non-masking and non-enforcement). But, for the majority of the country outside London, there simply is no kind of on-the-road supervisory staff any longer. The Ticket Inspector is a figure from history, as are any kind of traffic regulation inspectors. Clearly, the bus companies have identified that their customers want to be reassured about how safe their bus is and how much distancing there will be (hence all the posters, twitter messages etc about cleaning regimes and capacity). What is equally clear is that a large number of passengers are yet to return to using the bus. It may be that 'everyone' has returned but they are using it much less often, but I suspect not. I suspect a large group have either walked away entirely (me) or are down to absolutely necessary journeys only. I'm not using buses for the reasons given in #618,
@Deerfold is minimising his use, and so on.
I accept there will be vehicle and driver issues around this, but perhaps the solution is a two-tier bus system - one for scholars (of all ages) and one for everyone else. Some areas have this already, and have had for years, with closed door contracts. I'm thinking of places like Skipton, Settle and Kirkby Lonsdale, where the schools each see a dozen and more vehicles delivering the scholars daily. Many rural areas seem to operate on this basis and locally a similar situation exists outside of The Potteries but with very little contract provision within the urban area. COVID has seen a number of dulpicate 'scholars only' buses and some closed door contracts introduced. It's a personal view, but I would accept a short term reduction in frequency in order to deliver the buses necessary to provide a two-tier system.