Got a message saying my LetsEncrypt SSL certs had expired, and needed to renewed.
Hadn't done anything about it because of the faffing around I needed to do to enable SSL the first time around. Turns out it's a quick and easy job.
Looks like I shouldn't have worried about it..... Was able to have the new certs issues in less than five minutes:
Issued the command: certbot --apache
Said that I wanted certificates for all hosted domains.
For good measure, I restarted the apache service.
Then said that I didn't want any HTTP to HTTPS redirection related config changes... and away it went.
Most impressed.