Thank you Jo.
The engineer knew there was an oil leak. If the engine had seized before he told me to drive it, it would not have started.and run. The engine was therefore not damaged at that point. I am saying that the engine was not damaged before the engineer told me to drive the car and that the hole in the block was caused by driving the car. I think I need to get evidence that the engine would not have run with the hole in the block.
Thank you Jo - this is most helpful