So here is my current set up: ns1.hutber & ns2.hutber.com are pointing to hutber.com via c1domains.com ns1.hutber & ns2.hutber.com are pointing to wingspartytime.com via 123-reg
hutber.com is working perfectly
wingspartytime.com as far as plesk is concerned i believe it is set up in much the same way, 123-reg's name servers are set to the same, ns1, ns1.hutber.com. The only difference i can see is that in the hutber.com it has ns1.hutber.com A 18.104.22.168 in the DNS settings in plesk.
When doing a DNS lookup on both domains i get the following:
A record found: 22.214.171.124
None of the nameservers responded correctly.