I just reproduced the issues and will create a task to investigate it. However, I could recover the website by running this command
sudo /opt/bitnami/apps/discourse/bnconfig.disabled --machine_hostname www.cooperating-in-chiswick.uk
It's important to mention that the name of the tool is bnconfig.disabled because the HTTPS configuration tool renames it during the configuration process and that the domain you need to set is www.YOUR_DOMAIN.com because when using the HTTPS configuration tool, you accepted the redirection from non-www to www.
Let us know if that works for you. I hope you help as much as you can to your community with this forum