Sorry I have thought of just 2 more questions (before you start to invoice me for consultancy!)
1. re- the influxis site would you host the whole web solution (files and pages etc) with them or just the files that you want to stream and your website points to the influxis servers.
2. I have looked for streaming hosting plans with ISP's and can't seem to find much on offer (apart from big sites like REAL, or Quicktime) Do you know of any other value for money hosting providers that provide this service ?

Thanks again, your help has been really useful!!