I don't think CASA would ever allow instructors to work giving lessons in a private C172 out of a farm stip. How can anyone fly a plane without a 3000 page ops manual, 20.11 checks, profioncy checks, sign off, paperwork that could sink a ship. Shoot, before I have a pee I have to look up the current "approved method".
True or False question.
Did CASA once NCN a balloon company because the onions at the BBQ with the customers were not cooked in the manner specified in the ops manual.