When I search for an itinerary on National Rail Enquires from Cambridge to Stowmarket I'm shown the need to buy two tickets if I take a service which requires a change in Ely. On Sundays it seems there is a direct service every other hour, with a service changing at Ely in the hours where a direct service is unavailable.
I'm not 100% sure on how to use the maps in the routing guide, but my understanding of map AP is this route via Ely is mapped:

Which option is correct?
I'm not 100% sure on how to use the maps in the routing guide, but my understanding of map AP is this route via Ely is mapped:

Which option is correct?
