I guess my ex-colleagues are all in bed so I'll try and help!
As you suggest the book answer is correct. However, if traffic permits alternative, more direct routings can be accomodated.
Departures from the 24s via Thelwall weren't uncommon and arrivals via Swinton (or east of) are also little problem.
The reason you will sometimes be made to fly the "book" routes is the protection of the airspace immediately north of the airport for the possibilty of missed approaches from 24R; and to the south (ie in from Sandbach) when on the dual 6s.
It should be doable at most times, after all they're VFR!!! Hope that helps.