Apex domains cannot have CNAME records.
Question and response
Question
dig hostinguk.net. NS
Answer
hostinguk.net. 4 NS ns3.hostinguk.net.
hostinguk.net. 4 NS ns2.hostinguk.net.
hostinguk.net. 4 NS ns1.hostinguk.net.
Authority
The response has no authority records.
Additional
ns1.hostinguk.net. 4 A 84.22.166.197
ns2.hostinguk.net. 4 A 217.194.209.2
ns3.hostinguk.net. 4 A 109.169.17.171
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0