Here is an example of my config files:

site1.co.uk.conf

<VirtualHost *:80>
ServerAdmin email@site1.co.uk
ServerName site1.co.uk
ServerAlias www.site1.co.uk
DocumentRoot /var/www/site1.co.uk/www
ErrorLog ${APACHELOGDIR}/error.log
CustomLog ${APACHELOGDIR}/access.log combined
</VirtualHost>

site2.uk.conf

<VirtualHost *:80>
ServerAdmin email@site2.uk
ServerName site2.uk
ServerAlias www.site2.uk
DocumentRoot /var/www/site2.uk/www
ErrorLog ${APACHELOGDIR}/error.log
CustomLog ${APACHELOGDIR}/access.log combined
</VirtualHost>