Hii there,
Finlay speaking, I'm the tech guy of the website so I'm here to provide some more information.
Right now, I managed to fix the site redirect loop (but we still can't remove items from the cart).
If you want to troubleshoot the site, please keep the plugin "SSL Insecure Content Fixer" enabled (It is a band-aid for a very common problem with Cloudflare).
The link to remove an item from the cart (`.../?remove_item=`) seems to be different when using HTTPS and HTTP.
One used GET, while the other used HEAD.
Might the issue for which we have opened this ticket be caused by the SSL?
Warm Regards,
Finlay