PAT Guard 3 is the new, updated version of PAT Guard 2 which will additionally allow downloading and management of the Risk Assessment and non-PAT appliance items such as Emergency Lighting, Fire Extinguishers, Smoke Detectors etc, etc.
As I understand it, PAT Guard 3 has been written to work with the new Apollo 600 combined PAT and Risk Assessment device, so presumably, legacy Seaward downloadable PAT testers such as the PT350, will be able to work with PAT Guard 3 too, but not capture the Risk Assessment info.
I don't think that PATGuard 3 is available just yet, but I hear through the grapevine that the Apollo 600 is being released on 18th March and therefore PAT Guard 3 will follow shortly afterwards, if its not available at the launch.
I think also that Seaward may issue an interim updated software release to PAT Guard 2, to enable the Apollo to be able to download PAT info.
Just a thought.