Apex domains cannot have CNAME records.
Question and response
Question
dig vispa.uk.net. NS
Answer
vispa.uk.net. 5 NS tim.ns.cloudflare.com.
vispa.uk.net. 5 NS daniella.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
tim.ns.cloudflare.com. 3 A 108.162.193.145
tim.ns.cloudflare.com. 3 A 172.64.33.145
tim.ns.cloudflare.com. 3 A 173.245.59.145
daniella.ns.cloudflare.com. 3 A 108.162.194.228
daniella.ns.cloudflare.com. 3 A 162.159.38.228
daniella.ns.cloudflare.com. 3 A 172.64.34.228
tim.ns.cloudflare.com. 3 AAAA 2606:4700:58:0:0:0:adf5:3b91
tim.ns.cloudflare.com. 3 AAAA 2803:f800:50:0:0:0:6ca2:c191
tim.ns.cloudflare.com. 3 AAAA 2a06:98c1:50:0:0:0:ac40:2191
daniella.ns.cloudflare.com. 3 AAAA 2606:4700:50:0:0:0:a29f:26e4
daniella.ns.cloudflare.com. 3 AAAA 2803:f800:50:0:0:0:6ca2:c2e4
daniella.ns.cloudflare.com. 3 AAAA 2a06:98c1:50:0:0:0:ac40:22e4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0