(20 Jul 2014, 6:01 pm)Marcus wrote You can use it on the 28s, providing your not getting off on a part of the route that is only served by one service while you bought your ticket on the other. I think it might be best to ask a Chester driver though.
I think returns can be used on any service that serves the place you want to go to. I dont think the depot the service is operated from makes a difference (thats if im interpreting your post correctly).