I vaguely remember - in the dim and distant past - having to fly an air test to confirm the stick plot after someone else complained 'it didn't feel right'. I think it was in a Whirlwind (but could have been a Wessex) and someone 'downstairs' had a calibrated measuring stick to check the position at different speeds.
PS- They were quite right, it didn't feel right, but I can't remember why (rigging?)