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I have solved this issue

I have an old link request application which i have restarted. I have regenerated the api key, however i get 401 Your authentication failed on request.

The test signature works and returns my account no.

Here is my request:

http://lsapi.seomoz.com/linkscape/links/www.screwfix.com%2F?AccessID=member-12345678&Expires=1357316478&Signature=12345678910&Scope=page_to_subdomain&Sort=page_authority&SourceCols=133982846973

I have replaced my memberID and signature with dummy data to protect my credentials. Is my request string correct?

Also where can i get the expiry parameter?