Hi Tim,
If you are certain they have been buying links then try this https://www.google.com/webmasters/tools/paidlinks?pli=1
The reporting tool puts them on Google's radar and if they have been doing this then they won't last for long.
Jonathan
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Thanks again Irving; we're advising the client to stay away from directories anyway, and concentrating on providing a useful service for end users. Links, if they happen, will be a bonus we hope!
Thanks guys...;-)