Broken universal joint on half shaft

[AnkerB-S]

Yesterday I had my first real breakdown in the Caterham. I was going g through a fast left hander doing Autocross and a loud bang from the rear was followed by loud clanking sounds when the clutch was engaged.

Upon inspection I found that the universal joint at the differential end on the left half shaft was ripped apart.

I am a decent wrenched, so I plan to do the repair myself. I will deeply appreciate some opinions on how bad the damage looks. I assume there is a  splined shaft going into the differential and that I need to remove the wheel carrier to get the shaft out.

I should mention that when I put the car in gear and jack up the left wheel I can spin the wheel by hand, so there is no solid connection to the differential gears.

So do you think more than the tube attached to the differential is damaged on the differential side?

What is the make and model of the differential?

Where can I source the parts?

Any other advice will be hugely appreciated.

Thanks/Anker