The answer depends on what you want to call the nameservers. The beer.org.uk/bsacdns/ link is using the more typical domain name ns1.domain.tld type of nameserver name, rather than just the bare domain name.
Nameservers can really be called whatever you want, you just have to be consistent, using the same name on the nameserver itself as you point to at the registrar. Most people use names like ns1, ns2, ..., or dns1, dns2, ... because those names are self-descriptive. You don't have to wonder what those domain names are for.
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