DNS & 123-reg : why want my website display over the internet

I recently bought the domain sw-solutions.co.uk at 123 reg. Since then I have built myself a mini home network using Windows Server 2008 R2 Domain Modal. My main server is called Jupiter and is running DNS, DHCP and Active Directory I have also put a webserver on for testing purposes. When I am on the local network and type in www.sw-solutions.co.uk I get my website (IIS7 MS Default) try it externally (ie : the internet) and I get “Server Not Found”

Bit more about my configuration
 
Pipex Biasness Broadband with a 1 static IP Address: 81.179.6.55

THOMSON TG585 v7 Router configured with
•      External IP Address: 81.179.6.55
•      Internal IP 192.168.1.254
•      Primary DNS: 192.168.1.120
•      Secondary DNS: 212.139.132.4

Server

2x Network Ports 192.168.1.120 & 192.168.1.121

DNS Config

Forward Zone called sw-solutions.co.uk

SOA - Created by Windows ([45],jupiter.sw-solutions.co.uk.)
NS - Created by Windows (jupiter.sw-solutions.co.uk.)
A - Created by Windows ([192.168.120][jupiter.sw-solutions.co.uk.])
A - Created by Windows ([192.168.121][jupiter.sw-solutions.co.uk.])
CNAME – I Added ([www] [Jupiter.sw-solutions.co.uk.])

Any Ideas?

intresting thing when i look at the dns records using a who.is on sw-solutions : it says the dns servers are still is ns.123-reg.co.uk & ns2.123-reg.co.uk not jupiter.sw-solutions.co.uk