Ok. I've managed to get the filters to work, there was actually two skin folders that I had to copy, which were:
/plugins/mangesieve/skins
/pluging/sieverules/skins
This made the filtering start working. However, I can't get the responses to work. I've been through all the plugins and copies the larry to googie_larry on all them, just in case. But this still hasn't made it work. So I'm not sure what's stopping that one. However, I'm not to worried about the responders, as I can do that server-side.
It looks like the responses is part of the manageseive plugin, but I just can't work out why that one isn't working. Like I said though, it's not the end of the world.
Thanks for all the assistance, and pointing me in the right direction gents. Really appreciated.
Kev