Dating Direct was taken over early in 2007 by Meetic.com, and unfortunately since that time, membership number have fallen.
You can find the same people on Meetic Uk as Dating Direct, so both sites seem to share a common pool of members.
There has also been a number of negative comments about the changes.
The main complaint being that contact forms and online support are not available on the site (or at least are not easily accessible), and that there does not appear to be a way of removing your profile and canceling subscription payments once you are registered.
The ODA provides general information on common enquiries users have about dating services but will not deal directly with individual complaints which are properly the responsibility of member companies.