Apex domains cannot have CNAME records.
Question and response
Question
dig uk2group.com. NS
Answer
uk2group.com. 5 NS ns2.uk2.net.
uk2group.com. 5 NS ns1.uk2.net.
uk2group.com. 5 NS ns3.uk2.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0