If a Wordpress site shows a warning about PHP versions, then it can easily be updated on Heart Internet Shared Hosting.
Managed VPS can be done by open a support ticket with Heart Internet.
UK Fast Dedicated servers can be updated by opening a support ticket with UK Fast.
VPS on Tagadab needs to be done manually - please raise an internal support ticket to have this carried out.
Here is an short instructional video on our most common hosting, Heart Internet Shared Hosting