Many thanks Colin
As a prioraty I can then upgrade the Media server and 2008R2 box I need to upgrade.
I can then systematically upgrade the rest of the node in production time as installing new agents does not require reboots.
Speaking of deploying, for some unknown reason only this week the "remote agent install wizzard" does not start up. This is the case if I try and run it from the drop down menu or the link top right corner. No error message is diplayed. It simply does not appear.
Are there any known reasons for this. This is an issue I would have to resolve before any upgrades as using this wizzard is the only way to get the updated agent onto any nodes.