My hosting company finally got around to enabling Let’s Encrypt SSL certificates. I’d been nagging for at least a year.
I managed to move ALL my sites to SSL for free (apart from the ones I’d already bought certificates for), in one morning.
All I did was enable Let’s Encrypt for each site in turn, in PLESK, take the default options, and then use the “Really Simple SSL” WordPress plugin.
That’s it. Sorted. For Free. If your hosting company doesn’t support Let’s Encrypt, MOVE.
REMEMBER: Google promotes encrypted sites above others in search results. Chrome marks unencrypted sites as “Not secure”. You don’t want that.