Thanks Sérgio. I will have a look, although I had already searched very extensively before posting on here.
I can't help thinking these guys must have "special" treatment from Google, much like Dell do/did. They are suppliers of questionable-ish home/search hijacking software aimed at kids. It's
http://search.sweetim.com.
I am wondering if they are actually closely linked to, or part of LabPixies, who were acquired by Google a year or two ago. That might explain the apparent special treatment.
Or, I could be totally wrong, and it's just not mentioned in the CSE API documentation.
Thanks,
Carl
Anyway, I'm surprised that the Adsense API doesn't cater for retrieval of adverts for displaying on websites though.