I've taken the plunge and got myself a dedicated server for the forum and the blog. (using HostGator, based in Texas)
It's being set up now and should be ready within 24 hours, then I will start transferring everything, but that could take the best part of a day, so I'd expect the forum to be locked down for that period, and the DNS changeover to take the usual random time.
Updates will be on Twitter.
Sorry for the interruption, but hopefully this is for the better.
I don't think I can keep using this shared server for the forum and blog, it is CPU throttled 100% of the time now, and it's getting quite slow from my end.
Hopefully with a dedicated server just for the blog and forum database, it should scream?
The video and audio files and other sites will continue to be served by my other shared servers which are holding up fine and not being taxed too much.
Thanks
Dave.