Certbot fails with "Can't find virtual host" error

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On reading the Apache docs, I see that there is a missing ServerName field in my VirtualHost config (i.e. the guide I referenced is wrong). However correcting this and restarting Apache makes no difference. This is the corrected config:

# cat bree.org.uk 

<VirtualHost *:80>
    ServerName bree.org.uk:80
    ServerAdmin pocallaghan@gmail.com
    DocumentRoot /var/www/bree.org.uk/html
    ErrorLog /var/www/bree.org.uk/error.log
    CustomLog /var/www/bree.org.uk/log/access.log combined
</VirtualHost>