Apex domains cannot have CNAME records.
Question and response
Question
dig versio.uk. NS
Answer
versio.uk. 5 NS nszero1.axc.nl.
versio.uk. 5 NS nszero2.axc.nl.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0