Loge, Drxx, SmellyHarry. Thank you for your helpful comments. We already meet several of the criteria stipulated: mid-seventies, maths/physics graduates, grammar Nazis, attention to detail (parsing freaks), plenty of time and, above all, a particular love of elegance in puzzles. A chance meeting with Aedites in Myanmar about ten years ago set us on the path towards Listenerhood and enlightenment, or maybe endarkenment nowadays! Rather than submit and be rejected, we wanted to run some ideas past an editor before getting too far in and wasting time. Any useful names or numbers might be useful. Thank you all again.