How do I transfer my magix site to a .co.uk domain? I am using website maker 4 and an absolute novice at this.

There a three ways:

1. Transfer your domain to Magix (this is easy and quite convenient)
http://www.magix-online.com/uk/register-domain/domain-transfer.2647.html

2. Redirect you co.uk to your Website Maker website (to your Magix Subdomain)

3. Use the virtual Web hosting function
(If you publish your website you can choose "externally" (Publish dialog). Download the index.htm(l) file and transfer it to your external webspace (via FTP) of your co.uk domain.

If you purchased your co.uk domain from Magix it's quite easy. Choose this domain inside the Publish dialog.

Have you looked at the site where you bought your domain name ?

 search for url redirect if you want your domain to point to your site if it's hosted at Magix.