"owners" permission not good enough [as above post demonstrates]
Indeed. It was not my intention to suggest that the owner could give permission for aerobatics in a non aerobatic aircraft, but rather that a pilot should not be doing things in an aircraft which are not agreeable to the owner - even if it
is an aerobatic aircraft!
One of the local flying clubs had a 152 Aerobat. It could only be taken solo in the circuit, so they could see that you weren't sneaking out of sight to experiment!