Okay so it's not difficult to install, but as ever I want to share the steps we have used successfully.
So before you start yeah a reboot to start with, as we have seen that is just a better place to start the installation!
Generally it takes 10-15mins for the Rollup to install
Standalone Servers
Note. On Hub servers check all mail queues.
Mailbox SCC Clusters Passive Node
Active Node
Gaps found in Microsoft Exchange API documentation Windows Server 2008 & Exchange Backup I do not