Apex domains cannot have CNAME records.
Question and response
Question
dig coachhousenorbury.com. NS
Answer
coachhousenorbury.com. 5 NS ns-1238.awsdns-26.org.
coachhousenorbury.com. 5 NS ns-1552.awsdns-02.co.uk.
coachhousenorbury.com. 5 NS ns-885.awsdns-46.net.
coachhousenorbury.com. 5 NS ns-1278.awsdns-31.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0