Personal indemnity - not really needed
Hi,
In microlighting, we have had - on and off - a group policy for instructor's liability insurance through the BMAA.
It covers us for claims that we have not taught people properly, and costs about 80 a year IIRC.
Is it necessary? Well, after they have done a skills test, the liability really moves on - since someone independent has checked them out.
In training, just follow the procedures and keep paperwork up to date. Then you have done it by the book - so have some legal protection there.
Finally, this is an area where the CFI has to carry the can if you are an AFI!
Very best wishes.