Right thanks for all the posts fellas, car is now back up and running! I tried to jump it with the girlfriends car but it didnt give enough voltage to fix the issue, so I swallowed my pride and called out the RAC (I have it free with my bank) I also cant trickle charge the car as its in a communal parking area
So he came attached his booster pack and it fired straight up run for 10 minutes and he checked the battery condition which was good (cars still on original battery stamped 26 week 2005) and waited for all the computers to shut down and saw a standard drain of 0.2-0.3 amp after 20 minutes, so everythign is good, clearly my work last night stereo and ignition on for 45 minutes and my work today stereo on for 2 hours while doing the lights and then scanning and coding with ignition on for hour after not driving the car for a week was too much for it!
The clicking just panicked me especially as I have been playing with the gateway and around the fuse and relay box.