Hi @damianlewis
you use the webroot authenticator:
If that doesn't work, your webroot may be wrong.
What's the content of your config file:
/etc/letsencrypt/renewal
What says
nginx -T
Your main configuration looks ok ( https://check-your-website.server-daten.de/?q=laurdan.co.uk ):
But you have a redirect http -> https. So you have to use the https - webroot.