Thanks guys,

Some really helpful suggestions especially regarding the CP2E processor.

39 Cent - I will pull in my programmer / Crestron guy to check over the whole solution, he'll do an in depth visit to the site and make sure it can't be done better.
I just like to get a feel for it first given the customers requirements and come up with my own solution first then he can correct me if I've got something wrong - harder work for me but I feel it's the best way to learn.

Chris.