How can I have 1 AppleID for work and another personal ID for iCloud?

I have a "work" iPad2 with a Apple ID/Account that belongs to my company.
I want to have an additional personal Apple ID and iCloud Account that my work associates can't access (for music, non-work apps, iCloud).
I have upgraded my iPad2 to V5, set up a personal Apple ID and a new iCloud Account (via Settings, "Mail, Contacts, Calendars" page)
I have switched to my personal Account on iTunes (PC) and App Store (iPad2)
However, when I go to Settings, "iCloud", my (default) work iCloud Account appears and I can't find any way of changing it to my personal iCloud account.
Obviously I don't want to delete my work account.
Does anyone know of a way to be able to have 2 iCloud Accounts and switch between them? OR
Log off my "work" AppleID/Account (iTunes and iCloud) and log into my personal iCloud Account.