Apex domains cannot have CNAME records.
Question and response
Question
dig domainlore.uk. NS
Answer
domainlore.uk. 4 NS ns-1599.awsdns-07.co.uk.
domainlore.uk. 4 NS ns-917.awsdns-50.net.
domainlore.uk. 4 NS ns-215.awsdns-26.com.
domainlore.uk. 4 NS ns-1319.awsdns-36.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0