Let's not forget the CMA, It's not too difficult to figure out who would not be allowed to buy what.
I don't think First are in a very favourable position to sell, much of UK Bus would not appeal to the major groups at what might be considered 'An Acceptable Price' (Sure you can sell anything if the price is right, even a negative value) but all of First UK Bus subsidiaries are going to have a basic 'book' value (Vehicles, property equipment) plus 'Goodwill' etc.
As many posters have stated, what would be the point of selling off the 'Earners' - Leicester etc?
I suspect we are likely to see 'more of the same' possibly cranked up now that O'Toole has departed, what I mean by this is, ongoing cost cutting, route/frequency/pvr trimming, minimal Cap-Ex (minimum new vehicles) Even some more Depot closures.
Much will depend on the future economy, there are lot of unknowns, Brexit, Oil prices, personal taxation, LEZs, car ownership/running costs.