Apex domains cannot have CNAME records.
Question and response
Question
dig newzapp.co.uk. NS
Answer
newzapp.co.uk. 5 NS ns-559.awsdns-05.net.
newzapp.co.uk. 5 NS ns-1472.awsdns-56.org.
newzapp.co.uk. 5 NS ns-2014.awsdns-59.co.uk.
newzapp.co.uk. 5 NS ns-28.awsdns-03.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0