If your domain names are registered with us but your website hosted elsewhere and you want to update your DNS Nameservers then you can manage this yourself very easily from your billing account.
Simply login to your billing, my.wesh.uk/clientarea.php then, from the main page click on "My domains" which will present you with a colour coded list of your domain names based on their status (Active/Expired/Cancelled)
Next to each domain name you will see a button labelled "View Details", click this and you can now see all of the relevant details for this domain name and access everything needed to manage your domain name.
To change and/or update the DNS Name servers simply change the current name servers listed in the boxes in front of you and click the "Save changes" button.
Thats it, now just wait for your DNS to propagate around the internet.