@MarthinL Thanks. There is another topic with some messages from Let’s Encrypt here.
I tried to help Gideon and he really did provision 2 of 3 domains hosted on his MIAB.
the co.uk one and the https://philipalantyler.co.uk/ both recieived new certificates.
Please note that his box is hosted https://gideon-it.com/ and box.gideon-it.com so he redirects the MIAB to co.uk https://gideon-it.co.uk and http redirects to https on the dot com site.
Maybe he provide some logs from /var/log/letsencrypt/letsencrypt.log
For us to see what is going on.
Also his status page will be helpful. Thanks for jumping in @MarthinL