Apex domains cannot have CNAME records.
Question and response
Question
dig stechga.co.uk. NS
Answer
stechga.co.uk. 5 NS ns-222.awsdns-27.com.
stechga.co.uk. 5 NS ns-1357.awsdns-41.org.
stechga.co.uk. 5 NS ns-595.awsdns-10.net.
stechga.co.uk. 5 NS ns-2039.awsdns-62.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0