Apex domains cannot have CNAME records.
Question and response
Question
dig wavenetuk.net. NS
Answer
wavenetuk.net. 5 NS ns-1641.awsdns-13.co.uk.
wavenetuk.net. 5 NS ns-775.awsdns-32.net.
wavenetuk.net. 5 NS ns-487.awsdns-60.com.
wavenetuk.net. 5 NS ns-1442.awsdns-52.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0