Thanks for your help guys and from what I can see I was doing things just about correctly but the propagation wasn't happening quickly enough for my liking. Got up this morning and the site is now working all-be-it strangely.
What is happening now is that when viewing datingzoneonline.com it appears to be pointing to stiffs.co.uk and also if I make an FTP account for the domain it's doesn't work and also stops the FTP account working for stiffs.co.uk. As soon as I delete this account the old one starts working again.
I have created one client which is myself, two DNS zones for each of the sites and two sites but they appear to be cross linked in ways that I don't understand.