BobRay - thanks.
I ended up with:
$url = 'hppp://api.twitter.com/1/statuses/user_timeline.json?include_rts=' . $includeRts . '&Screen_name=' . $screenName . '&Count=' . $count . '';
which seems to work, returning $ouput to the screen -
Time: Thu Oct 04 09:28:50 +0000 2012Tweet: Nice idea RT @TechCrunch: Amazon Offers A New Simulator For Developers To Test Email In Apps http://t.co/dnSm9Scn by @alexwilliamsTime: Thu Oct 04 09:27:27 +0000 2012Tweet: RT @joseeight: am i the only one annoyed about Microsoft's IE9 campaign? i see ads all over the place, how about spending the money gett ...
What I don't get is that it was setting
&Count= &Screen_name= to have a leading capital letter that made the difference - which was a bit unexpected.
Off now to order your book and look for hints on how to display $output sensibly !