Why not form limited companies, one for the flying club and one each for every aircraft that the flying club uses. Yes there are costs involved, accountant fees and filing fees but as long as you keep little or no assests in the flying club there would be little point in the revenue chasing the club-a man of straw is not worth sueing. The added advantage in this day and age is that one accident that results in a claim by an injured party would not effect the other assets.If the revenue deem that a person is an employee and not self employed they persue the employer not the employee