Thanks for that, I'll have a look through my collection and see what I can find 
I also have a question about the 47uf bipolar capcitor...
Does it have to be an electrolytic or would a ceramic cap work?
Also if I get to electrolytics and use them pole to pole, would it be ok to have a larger value or does it have to be 47uf?
I'm still learning myself so it will help me to understand why those particular parts were used.
I ok at building a circuit from a schematic but I don't really know why certain parts are chosen over others
Thanks again