Re: BAE Systems will carry out the upgrade
Don't get me wrong, XP was streets ahead of previous Windows version for stability at the time...
If your previous version was Windows ME I can see how you might think that, but surely most El Reg readers will have moved to XP from WIn2k which was also very solid and reliable (for a Microsoft OS, that is).
If nothing else it doesn't support UAP so elevated priviledges (sic) is a potential worry.
I assume you mean UAC, rather than UAP, as you talk of privilege elevation.
I think you have that the wrong way around. UAC is a system introduced by Microsoft to reduce system security, albeit in a somewhat controlled way, so that people who aren't used to working with "normal user" accounts don't have to remember to "Run as Administrator" (or to log into an Administrator account in the first place) when they want to do something that requires administrator privileges.
It's perfectly possible to work with normal user accounts without UAC, and to do so without any "potential worry" of the system "helpfully" elevating privileges when you least want it to.