The hostname relates to the hosting company as opposed to your domain, my hostname is ns1.streamlinedns.co.uk because my hosting company is streamline.net, so anyone who uses streamline as a host would have the same nameserver as me, 123-reg will have their own nameserver, I'm assuming the hosting you have taken out is branded as 123-reg?
To get Domain and Host to communicate, you set the nameservers on the domain control panel to relate to your host, then you log into your host and add your domain.
To get Domain and Host to communicate, you set the nameservers on the domain control panel to relate to your host, then you log into your host and add your domain.
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