Was thinking just the same the other day, but was unsure as to how to resolve it.

The BBC regions page on their website or teletext may help or provide some inspiration if you are looking to split things into regions.
Maybe merge one or two regions together - eg East Midlands, Lincs and Humber or Merseyside, Greater Manchester and North Wales.

Another suggestion is to have a thread for the region split into sub-sections.

East Midlands, Lincs and Humber.
-> Stagecoach
-> Trent Barton
-> NCT
-> independents.