Hi Green-Moo, yes it is completely separate and covers a much wider area. The congestion charge only covers central London, but this will cover just over 600 sq miles.
All lorries over 12-tonnes will be affected, and therefore will be the same for buses. Getting a smaller bus will reduce emmissions so it's a good thing! They won't be escaping the regulations at all, they will be complying with them. They are only charged if they are polluting. If they get a new smaller bus/lorry, they won't be polluting!
All 12-tonners made after October 2001 are already within the low emissions guidelines, so new buses will be too. It's basically an attempt to get the biggest polluters out of the city.. Job done
