Hi Paul, Thanks very much for your reply. Not sure why the engine was running but they had in fact just finished doing the tracking and it was on another ramp to balance the wheels and the wheels were left hanging when the reservoir failed and they had not removed the cap. They had had a great deal of trouble adjusting the tracking due to the constant changes with the suspension so useful advice on this thanks. It's being recovered to a Citroen specialist for repairs so they should be well aware of procedures.