Apex domains cannot have CNAME records.
Question and response
Question
dig domainlore.co.uk. NS
Answer
domainlore.co.uk. 4 NS ns-713.awsdns-25.net.
domainlore.co.uk. 4 NS ns-1898.awsdns-45.co.uk.
domainlore.co.uk. 4 NS ns-126.awsdns-15.com.
domainlore.co.uk. 4 NS ns-1104.awsdns-10.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0