Thanks for all the replies so far.
It does seem very possible to be able to write impressive stuff without the need to read music. I performed as a session guitarist and live performer for years, and I was able to get to grips with writing full pieces of orchestral music on a PC i.e.sampler/sequencer.
However, I seem to be stuck in a comfort zone. I feel that I am limited to what I can achieve now. I know that constantly experimenting and experimenting will eventually lead to knew results but it takes a long time. Because I want (desire) to compose big scores like the movies mentioned above, I can see that learning theory is a must. I will make that task a priority as I felt it was comming sooner or later.
For the time being I want to improve my knowledge of basic percussion. Does anyone know where I can access a midi score that demonstrates the use of the Vienna Pro Percussion, so I can actually see which instruments are being used and get an idea of the structure. When I produce my own rythms I use a bass drum, timpani, snare and field drum but I can't acheive a really good exciting feel. When it comes to cymbals and percussive instruments I just make it all sound cluttered and end up scrapping it. I am searching for live recordings of orchestral percussionists online but not finding anything helpful. It's the military/marching rythms I am interested in.
Any suggestions will be very appreciated.
James.