DNS for inprocess.org.uk is currently not configured correctly. [Support Guide] DNS Quick Start - How to set up DNS provides the required setup which is the apex inprocess.org.uk should have an A record with the value 75.2.60.5 (which it does) and the www sub-domain should have a CNAME record with the value famous-longma-ede304.netlify.app (currently the CNAME value is inprocess.org.uk).
When it comes to receiving notifications, this is unlikely to work because there are no MX records configured.