Often when you first map the frequent network, you notice for the first time how self-disconnected it is. Nottingham's frequent network is entirely radial with just one frequent orbital (crosstown) service spanning about 45 degrees of arc along the west side, easily seen on the full map. The orbital is an extension of a radial, but it's clearly in an orbital role for a while.
One of the great outcomes of frequency is easy connections, so once you map the frequent network you usually start seeing opportunities to build more non-downtown connection opportunities, whether they be full orbital lines or just ways for two radials to connect (or even through-route at the outer ends) so as to create more direct travel opportunities within a subarea of the city. For example, looking at this map, I immediately wonder whether 44 and 45 should be combined into a two-way loop so that you could ride through, say, between Carlton rail station in the far southeast corner of this image and Mapperley in the centre. (You wouldn't present it as a loop in the schedule. You'd still call it 44 and 45 but note on the map and in the timetable that 44 continues as 45 and vice versa. This is how you build more direct travel opportunities in small city while still keeping the network legible.)