It shows you how to create slave zones with ISPConfig, because that's what you need - a slave zone for mad2.co.uk instead of a master zone. Delete the master zone for mad2.co.uk and create a slave zone instead.
How shall we help you if you do not post the error message that you get when you try to install ISPConfig...
Error message when running ./setup on ispconfig 2.2.14 no lex in (/sbin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/usr/local/libexec)
This means that you missed to install flex. On debian or ubuntu, run: apt-get install flex on redhat / centos: yum install flex