I am finally confident enough with my VPS and the control panel I've installed to consider moving us over once and for all. I can then get rid of our current host which, while being incredibly fast and stable, is expensive by normal standards.
If I self impose a break from work I'll try and get us over in the next few days and, as usual, you can expect a short break in service if not a few things being odd for a while (your timezone etc).
I'll keep you all posted.