The instructions I followed were clearly very well written because I encountered very few.
My first attempt to get to my newly configured site resulted in a "502 Bad Gateway" error from nginx
Checking the error log for the website, showed that there was mis-matched config files for the location of unix socket for php-fpm.
/etc/php-fpm.d/www.conf had listen = /var/run/php-fpm/php-fpm.sock
The error indicated that /var/run/php-fpm.sock could not be found - nginx was looking for a different socket file.
This is configured in upstream_phpcgi_unix.conf (called from nginx.conf where you set which upstream handler you are using, tcp or unix sockets)
I made them both /var/run/php-fpm/php-fpm.sock
Restart nginx and I got another error:
"Unable to open primary script: /var/www/sites/entries.mydomain.net/index.php (No such file or directory)"
This was because I hadn't correctly set the root directory of my site in the conf file for this site. Change it to
/var/www/vhosts/entries.mydomain.net/htdocs (the root of the drupal installation)
Restart nginx again. Site now work. Hooray.