It's alright for ideas to continually change cuz when they do, they actually get better and better. It also means that the ideas become fresher rather than staler. I suppose its natural in the end and yes, I have actually heard of a group that's managed to scrape it into the A-range after composing their work a week before the performance. Alot of hardwork though.
Hmmmm, it's a tricky thing. I'm just thinking about it in case we end up with something we don't like and want to change it quickly, but I actually feel more confident with our GP since I started this post. Thanks for your help anyway.