Apex domains cannot have CNAME records.
Question and response
Question
dig jaws-guideservice.com. NS
Answer
jaws-guideservice.com. 5 NS ns-1932.awsdns-49.co.uk.
jaws-guideservice.com. 5 NS ns-1549.awsdns-01.co.uk.
jaws-guideservice.com. 5 NS ns-1252.awsdns-28.org.
jaws-guideservice.com. 5 NS ns-1940.awsdns-50.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0