I am sure that I recall seeing in the kitchen Garden magazine or possibly the organic garden magazine some time last xmas an advert for a book abbout companion planting I think which came with a free planting by the phases of the moon calender. Of course a quick look through my back issues has not revealed which issue but I can undertake a more extensive search if anyone wants me to.
The one folk rule that springs to my mind is that you should not plant runner beans outside until you can do so naked! I'm sure that could lead to some interesting sights throughout the countries gardens and allotments !