Here's where we are at:
Practice Run:
Call this a rehersal if you like

The main problem for me is moving the database, it is over 30mb uncompressed, this meant that it failed when I tried to restore it to the new host.
I have got around it by breaking it into chunks and submitting it as much smaller sql queries and successfully transfered 44,000 posts today in 2.5 hours.
At the moment I am downloading all the physical files from DBF, I will then upload them to the new place.
Then I will grant relevant privilages to the database and alter the site settings.. Hopefully then I will have a duplicate copy of this site that I give to the moderators for testing.
If this goes to plan then I will begin the actual transfer process, I schedule this to happen around the 25th July.
This forum will be off line for between 1-3 days.
This is necessary because there will be a delay in swapping the DNS and I dont see the point of leaving it open here because new posts would be lost.