I've found another image in usage in article without my (and other authors) name under the work.
Bryan was so kind to answer:
A requirement that is more honoured in the breach unfortunately. In my experience the Mail Online never provides the name of the photographer, don't think that the Telegraph does either, but they do normally cite the name of the agency. The Guardian and Times are a tad more punctilious.
Here on Alamy terms (http://www.alamy.com/terms/uk.asp#General) we can read:
4. Credit and Copyright issues
4.2. Unless otherwise agreed in writing