Just an update,
I have now installed roundcube. I did get an error when applying the hostgeekz patch to one of the cpanel files (a cgi file I think). A "Hunk error at line 61"??
Anyway it all seems to work so maybe the above error wasn't important.
Something I would mention to the EUK admins is that the install blog on this web site hosting is a bit difficult to follow as the command lines flow onto a new line in places making it look like two seperate commands. This is fine if you're familiar with unix commands but if you're not like me it is pretty confusing. I actually ended up following another tutorial in the end
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I've also added a webmail subdomain with forwarding directly to the roundcube index page as this is the webmail client I want to use as default.