So many useful & interesting contributions here...turning into something of a composer/tech mini forum! As I said further back in the thread, I have discovered 'hidden score writing depths' to Logic Pro. A 'One to One' session at my local Apple store proving extremely helpful. The bottom line is, ultimately I have to produce my scores in PDF format, paying close attention to the 'house style' of my publisher. 'MuseScore' & 'LilyPond' (thanks for the links Mark) are new to me & I will be giving them a close look. Thanks also to Leeneia (apologies for spelling your name wrongly in all previous posts!)   for your good wishes...your friend with the string orchestra is just the sort of person I'm writing for. My arrangements & original compositions will be available to download sometime in 2011 from a new music website, currently under construction. It's a large project involving individual writers like myself right through to long established, international music publishing companies. The legal/logistical side of all this is somewhat daunting, but the Musician's Union in particular has been personally very supportive. I hope the wider discussions on writing & score production that have been developing in this thread continue on a while. They make for fascinating, informative reading. My thanks once again to everyone who has contributed,
                                                          Nigel Paterson.