So checked all logs as per: https://technet.microsoft.com/en-us/library/bb932135.aspx
MCS is enabled - had to re-install it, as per
http://blogs.technet.com/b/configmgrteam/archive/2013/08/07/known-issue-update-to-mcs-msi-fails-to-upgrade-the-multicast-configuration.aspx
Image is multicast...
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