404 after successful deploy

I’ve uploaded a very simple, single page static html & css site to Pages.

I uploaded the files manually and they’re showing as present:

Screenshot 2024-02-14 at 22.52.35

But the site just gives a 404 on tmccl.pages.dev and the custom domain tmccl.co.uk

I can’t see anything I’ve done wrong - it was all so simple and straightforward