Thanks for the suggestion. I'll see if I can find the materials for sale on line - it's a while since I did an OU course, the last was Understanding Music, since discontinued, but way back in the mists of wossname I did the Science foundation course, the start of a long relationship with Milton Keynes!
I'm not sure that I'll be hunting snails however, I think that I'll rely on our virtual Snail for enlightenment!