vserver0.versio.uk has no CNAME records.
Question and response
Question
dig vserver0.versio.uk. NS
Answer
The response has no answer records.
Authority
versio.uk. 10303 SOA nszero1.axc.nl. hostmaster.versio.uk. 2017032800 14400 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0