Hi again sorry, I just tried those, I must've overlooked it
The first one made no change, if I tried to request the site that has no files it still gives the same error and says "You don't have permission to access /www.site2.co.uk/ on this server." and trying to load another site from it works
The second piece of code got rid of the "You don't have permission to access /www.site2.co.uk/ on this server." and just put / instead, then then my working sites woudln't load, no images would load (which call /img/foo.jpg) so I guess it changed something there
The third (both together) reacted the same as above (second), but had the issue with the images too
Hope this helps somewhat? Once again, I appreciate the help.