Thanks mate.
I have my PS3 profile set up on other consoles. I have 4 friends (two with two machines), and when I go over we can play MP or LAN on individual screens, but using my own profile.
That allows you to download map packs onto those machines aswell. I will have to deactivate one i think, until i get my old machine fixed. I can then deactivate trhat before setting it up for my daughter.
Probably not as simple to do as that though! Will have to to trawl the forums when i get a minute.
Knowing how it works is completely different to understanding how it works.