X5 Driveshaft / Front Diff Issue

[S99]

I was pulling away from traffic lights the other day, heard a bang and momentarily lost drive. I had a look underneath- both CV boots (inner - diff side - front) had popped off.

It now seemingly drives ‘OK’ from my 5 mile slow drive home from where it happened though under any sort of acceleration the 4x4 light illuminates. There was also a burning smell - which I presume is CV boot grease, maybe some diff oil burning where it’s hot on the exhaust or engine.

Now my dilema is - what has failed, front drive shafts? front diff or transfer box?

I have linked a picture of the aftermath - https://ibb.co/HKQx90b.

If it is just the front drive shafts, will it have damaged the splines on the diff?

Prior to the above, there was some juddering at low speed, but haven’t owned the car long so never got round to investigating

Any help is appreciated