Apex domains cannot have CNAME records.
Question and response
Question
dig uk.t1cloud.com. NS
Answer
uk.t1cloud.com. 5 NS ns-1613.awsdns-09.co.uk.
uk.t1cloud.com. 5 NS ns-1276.awsdns-31.org.
uk.t1cloud.com. 5 NS ns-455.awsdns-56.com.
uk.t1cloud.com. 5 NS ns-878.awsdns-45.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0