I don't understand why any ECDs are available from Chorley... it's not on
this map.
There being no Chorley to Bolton Evening Return is incongruous with the other places outside GM that have them... e.g. Congleton has them to Macclesfield, Prestbury, Adlington Ches etc all the way in to Manchester.
That may be a bad example of something that does follow the rules though, because there are Evening Returns from Congleton to Salford Crescent, Clifton, Mauldeth Road - Heald Green inclusive and Eccles and Patricroft (and goodness knows where else!). This doesn't seem to fit in with the structure quoted, which is, for reference:
Northern said:
Cheap Evening Return tickets are half the price of the Adult Off-Peak Day Return ticket and are available as follows:
between any two stations in the grey area on the map (change of trains is allowed)
between any two stations in the white area or any station in the white area to any station in the grey area or vice versa (no change of trains allowed and your journey does not go beyond Manchester)
You have definetly got to change trains to go from Congleton to Heald Green! But I wonder if you are supposed to go via Wilmslow, given it says you can't go beyond Manchester with them?