Going through the single/double engine failure procedures and I can find no instructions to switch the SHED BUS switch to Emergency in either the Manufacturers Flight Reference cards (Appendix A of the AAIB report), or the Emergency Procedures (Appendix G). I note the report says that 'contractor instructs' to carry it out, but that is not the same as having it in front of you as you are going down.
I also question the effectiveness of RADALT over a built up area. What use is the height above nearby buildings during autorotation?
DV