We have recently updated all PHP5 installations to use the new Microsoft FastCGI process. This should significant speed and reliability improvements for sites running PHP5.
For sites runnign PHP4 we highly recommend updating your site to use PHP5 as it is now considered stable and prvovides much greater speed and reliability.
To change a domain hosted by AGUK to use PHP5 you simply need to perform the following:
Log in to Helm
Proceed to Domains > domain.com > Web Site Settings
Scroll to the bottom of the page and then change the drop down from PHP4 to PHP5 and click Save.
If you are a WordPress user we recommend reading the article below prior to upgrading to PHP5: