Apex domains cannot have CNAME records.
Question and response
Question
dig mossfieldprimaryschool.com. NS
Answer
mossfieldprimaryschool.com. 5 NS ns1.mossfieldprimaryschool.com.
mossfieldprimaryschool.com. 5 NS ns2.mossfieldprimaryschool.com.
Authority
The response has no authority records.
Additional
ns1.mossfieldprimaryschool.com. 5 A 199.188.236.35
ns2.mossfieldprimaryschool.com. 5 A 23.160.194.183
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0