Command Used: certbot certonly --dry-run --agree-tos --standalone --preferred-challenges http --http-01-port 80 -d www.example.com
Results are as follows:
IMPORTANT NOTES:
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The following errors were reported by the server:
Domain: www.example.com
Type: connection
Detail: DNS problem: query timed out looking up A for www.example.com
So as I said, it appears that there is still an issue with NetRegistry and LetsEncrypt - but it would be good if someone could confirm that - thanks.