Thanks very much for all the advice! I knew that mudcatters were forthcoming, but I didn't expect so much help so quickly. Unfortunately I don't have access to a 'pro' fiddler where I live who could tell me where I'm going wrong, but I shall certainly look into all those other suggestions (might be able to get correct position from a book or video). Perhaps a better bow might just be the answer too!

Cheers and thanks for all the info,

Isabel