Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-60.co.uk. NS
Answer
awsdns-60.co.uk. 5 NS g-ns-1216.awsdns-60.co.uk.
awsdns-60.co.uk. 5 NS g-ns-956.awsdns-60.co.uk.
awsdns-60.co.uk. 5 NS g-ns-380.awsdns-60.co.uk.
awsdns-60.co.uk. 5 NS g-ns-1537.awsdns-60.co.uk.
Authority
The response has no authority records.
Additional
g-ns-380.awsdns-60.co.uk. 5 A 205.251.193.124
g-ns-956.awsdns-60.co.uk. 5 A 205.251.195.188
g-ns-1216.awsdns-60.co.uk. 5 A 205.251.196.192
g-ns-1537.awsdns-60.co.uk. 5 A 205.251.198.1
g-ns-380.awsdns-60.co.uk. 5 AAAA 2600:9000:5301:7c00:0:0:0:1
g-ns-956.awsdns-60.co.uk. 5 AAAA 2600:9000:5303:bc00:0:0:0:1
g-ns-1216.awsdns-60.co.uk. 5 AAAA 2600:9000:5304:c000:0:0:0:1
g-ns-1537.awsdns-60.co.uk. 5 AAAA 2600:9000:5306:100:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0