Your website is working fine from here using HTTPS.
I don’t know why you’re having trouble accessing your website. Even if the SSL certificate is invalid or missing, you would get an SSL related error. If you see a timeout error, it means you are unable to connect to the server entirely, at which point it should be irrelevant what you have setup SSL wise.
If you want to revert away from HTTPS, you can do that right now. Waiting for the SSL certificate to expire will not help you there (see point above). Instead, you’ll want to:
- Remove any .htaccess code that forces traffic to HTTPS.
- Update your WordPress site URL to no longer use HTTPS. The WordPress documentation have some instructions on how you can do that without access to the WordPress admin area: Migrating WordPress – Advanced Administration Handbook | Developer.WordPress.org
After that, you should be able to access http://theadvancedaudiophile.infy.uk/ (WITHOUT the s) and use your website again.