Apex domains cannot have CNAME records.
Question and response
Question
dig sciencejobsuk.com. NS
Answer
sciencejobsuk.com. 3 NS ns2.sciencejobsuk.com.
sciencejobsuk.com. 3 NS ns1.sciencejobsuk.com.
Authority
The response has no authority records.
Additional
ns1.sciencejobsuk.com. 3 A 5.79.127.88
ns2.sciencejobsuk.com. 3 A 185.17.187.229
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0