17d. is it martian? Don't understand why if it is! 21a. after diversion reach old town near Manchester. Is it Rochdale, and if so, why? Ta for help. Brain has well and truly seized up!!!
many thanks kayakamina and Lipsiot. Soooo obvious when you pointed them out! No wonder I couldn't find any other reference to these 2 clues!!! Am much humbled!!!