This is what we got back ...
Here's the reply - I think it's quite big
<?xml version="1.0" encoding="utf-8" ?>
<rsp stat="ok">
  <photos page="1" pages="1" perpage="100" total="71">
    <photo id="8576838565" owner="50220141@N08" secret="949a10cc49" server="8526" farm="9" title="Hen Party Cake" ispublic="1" isfriend="0" isfamily="0" />
    <photo id="8571855236" owner="50220141@N08" secret="a000cdefb0" server="8512" farm="9" title="Planes and Trains Cake" ispublic="1" isfriend="0.., etc

Hi -
I have a pro license both with simpleviewer as well as flickr - my simpleviewer is set to 150 photos that are fed through from flickr tags.  I have several tags that use to show different image sets - some showing as many as 140, however, one gallery is stuck on 99 photos - is this a flickr problem or have you come across this before?
Thanks very much