Apex domains cannot have CNAME records.
Question and response
Question
dig newtonsofbury.com. NS
Answer
newtonsofbury.com. 5 NS ns2.newtonsofbury.com.
newtonsofbury.com. 5 NS ns1.newtonsofbury.com.
Authority
The response has no authority records.
Additional
ns1.newtonsofbury.com. 5 A 149.56.130.74
ns2.newtonsofbury.com. 5 A 15.235.75.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0