Hi Lorna Jane, great article.

You can also use .htaccess to control the version of PHP you want your script to run.
http://stackoverflow.com/questions/12561203/how-to-change-php-version-in-htaccess-in-server

Here is a post i have wrote about how to run multiple versions of PHP on Windows with Wamp Server. http://kbariotis.wordpress.com/2014/08/02/multiple-php-versions-on-wampserver/

Cheers