"Colin Rosenstiel" wrote in message
...

I thought the existence of zones A, B, C & D was because, unlike Essex,
Bucks were too mean to contribute to the cost of the services on the Met.

Before the Ongar branch shut there were letter zones on the Central Line.
IIRC Epping was in Zone A. I always assumed they moved it into Z6 when it
was left as the sole station on the line outside Z6.

Dave