Sorry to sound an ignorant git but for one who just plays by ear this all sounds very technical. I'm sure it's all very simple really (a bit like maths, which used to frighten me to death at school) I have tried learning the stave/notes/scale thingy but got a bit tangled when actually applying it the instrument. I must be missing out on a lot.

P.S One of the best whistlers i ever saw/heard was Packy Byrne on stage with the Spinners yonks ago. Now i'm showing me age. Then there's Terry Walsh and Vin Garbutt.......one day.

Happy whistling folks!