According to the doocs..
After install
http://servername/sitex to get to the interface to setup - is this occuring for you?
Then
http://www.mysmedomain.com/sitex to access site as per normal and then run
signal-event sitex-post-upgrade to delete setup files - is this what is happening for you?
You noted that you are using
https://www.<domainname.co.uk>
and
https://<domainname.co.uk>/index.php
note http
S None of which are described in the docs as how to access the site post install..
This,
https://www.<domainname.co.uk>, is not going to work out of the box without the ip addy pointing to the sitex "site"
The docs clearly states that after setting the FQDN the site is accessable from
http://www.mysmedomain.com/sitex..
To have it accessable from
http://www.mysmedomain.com takes more than just changing a URL in sitex..
heres a tute on redirecting a url to the /opt/xxxx
I am sure there are others here who can explain it better