Turned out the Endpoint components were not installed and could not be re-installed until I raised a call with MS and spoke with Faisel - his blog post found
here solved the problem for us.
The problem seems to emerge on WinXP when a non-admin user attempts to install the components from the UAG site - the product partially (maybe 1%) installs which then leads to an issue when you try to install the components as an admin - the yellow bar wont
appear in IE and also the manual installation (via MSI) fails.
The answer is to agressively uninstall the components via a registry cleanup which is documented in the blog post (linked) there's also an AutoIT script mentioned in the comments section
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