Freelander LSD Diff Rebuild Needed

[MikeE]

Managed to break my Freelander LSD diff on my Fisher Fury R1 on a Rockingham trackway yesterday. It was making a nasty grating sound (like splines grating over each other) then I lost all drive on track. Now when I push the car the drive shafts obviously turn but the propshaft doesn't!

Can anyone recommend where I can get this rebuilt/exchanged or find a replacement and what typically breaks causing the above symptoms?