Nerys, thank you for the help. I will tell you now the steps I have taken, I spoke briefly this morning on live chat and thought I had cracked it, but unfortunately not.
Ok so via control panel selected the domain with the Linux Unlimited Yearly hosting, clicked manage hosting and then file manager. From there I created a new folder and in that folder added a .htaccess file with the following information :
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
then I clicked on Apps, then looking for more apps, then install wordpress, I am then confronted with the screen and the 2nd domain I would like to add the new installation too. for example: newwebsite.co.uk/newfolder (It does say insure this folder is empty) I have my .htaccess file in there though, but I have checked and clicked next anyway.
I then used existing passwords for wordpress and the admin screen that follows. Next is the following :
"If you wish to make your chosen application (i.e. WordPress) the default homepage for your site, please check the box below. This will result in the installed application being located at your root URL, for example http://www.mydomain.com.
Please note: If you check this box your current .htaccess file will be permanently overwritten."
I didn't check this and clicked next.
Click install, but for some reason it is installing to a different directory, for example newsite.co.uk/new/newfolder, even though I didn't want it to go there (I don't think)
I thought I would try mapping to the installation folder anyway.
So from control panel select domain that I want to use the new word press installation on, click manage and then domain mapping. I have used this screen with mixed results, I have tried several times to map, sometimes it looks like it has worked, but the mapping information never seems to stay stored. After refreshing and getting the map up, clicked add, selected the site I want word press on, in the middle my main site with the unlimited pack and then looked for the folder I created (example: newsite.co.uk/newfolder) it is there but after checking in file manger it is empty).
I just checked file manager again (I can give you all the proper details if you like but it seems that wordpress had installed here example again : publichtml/newfolder/newfolder/wp-admin/newfolder/ lol. My head is in a spin here, I am going to get something to eat and then have another sit down.
This morning I could map to the installation directory at least but when I tried to load the domain it would just direct me to 123-reg's site
I am probably doing something silly here
Cheers