I cannot be bothered to explain the detail (sorry, not sorry!) but you have done terminal damage to the engine internals if you have driven the car for 60 miles with less than 1 bar of oil pressure coupled with your description in your most recent post - the warning is triggered at around 0.8 BAR from memory which isn't even enough at idle never mind when driving. If you had stopped at the time you probably would have gotten away with a sump clean and/or new oil pump
Look for another engine, its really that simple. Any time/money/labour spent on this one is just wasted