We have uploaded new trainer files for the Sophos Firewall Technician v19.0 and v19.5 courses with a new lab workbook.
The change is to import a configuration file on London Gateway 2 that does not have the bridge configured. This is now configured as part of the HA lab.
Having the bridge configured on both London Gateway 1 and London Gateway 2 was causing high CPU usage on the firewall VMs. We are still investigating this, but this workaround means that there is only a short period of high CPU usage between configuring the bridge and successfully creating the HA pair. Once the HA pair is configured the issue no longer presents itself.