Hi Keith,
Let’s clarify the information: when user accesses www.kernowecoclean.co.uk, he will be redirected to www.kernowecoclean.com .
As the URL redirecting service is provided by the domain registrar, the above action should be performed on the domain registrar side. For more information, you can refer to using a URL redirection service with Office 365.
Please refer to the following steps to do so:
1, Re-delegate your www.kernowecoclean.co.uk domain name server at your domain registrar.
If you don't know how to do this, please contact your domain registrar (Melbourne IT)'s support and let them to do it for you.
2, Contact your domain registrar for the URL redirect service, to redirect the kernowecoclean.co.uk domain to kernowecoclean.com.
Thanks,
Ida Qiu