While I'm installing mmysql and apache as part of the apt-get command, I'm
also meant to be configuring them in another terminal window? What happens
if I get to that stage and something has not installed yet?
Well spotted... the answer is that mysql and apache should both have
been installed as part of the initial OS installation, when you picked
"LAMP Server" as one of the server roles. They are in the apt-get
command just as a belt-and-braces thing, in case they get the earlier
bit wrong. If you think that's confusing, we could take them out.