Well there's a big gap between something like London, a very dense city, and actual countryside. There's also a big variation in will. Where I grew up (Metroland, just beyond the end of the Metropolitan "underground" Line) the services are (other than the afore-mentioned London underground) abysmal because providing services costs money & people there want lower taxes. But where my mother lives today, near Bingley, there are enough buses that I get confused as to which one goes closest to her house when I visit.

The difference in London is also in large part because London was allowed to retain a unified transport system when Tories dismantled other systems because ideologically their position is the Invisible Hand of the Free Market will fix everything.