I’ve got the differential open, and while speaking to Simon Stevinson, I realise that there are actually a few bits missing.

Looking at the picture below, all twelve big bolts are present, but of the eight smaller allen headed bolts, only one is present. The others are either entirely absent, or the heads have sheared off.

These bits have been floating around, and have caused a few chips to the crown wheel, and I conclude caused the damage to the speed sensor. The lack of movement in the bearings suggests that the crash damaged wheel is a bit of a red herring.

Here are a few more pictures of the damage to the crown wheel. It’s chipped only at the edge.

The differential is going to go up to Simon’s this weekend for further inspection. In the meantime the car has Robin’s open differential, and amusingly, that diff is running the old oil from the LSD, which means that those bolts are now getting ground up in that differential too. Nice!