GitHub pages now publishes my site as unsecured - http: not https:

[MarkWilcock]

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Today, GitHub pages is serving up my site as http//. It is no longer https: secured. Yesterday, it was serving up my site as https://

I have made tiny changes to content but nothing that should have forced this. I have also checked the site at https://letsdebug.net/ and there are no issues.

I have a SSL certificate - it was bought and issued by GoDaddy, where my site was before I moved to GitHub pages

Any ideas / suggestions on what may be the cause and how to fix gratefully received!