Rover owners: ZS 180 explosive oil leak?

Friend following my car said my car smelled awful, thought it a bit strange as it wasn't smoking and was running fine. I pulled over to find the drivers side of my engine bay covered in oil :( its also all up the bonnet and on the coolant tank.

Been told its the oil cooler pipes, where exactly are these as I can't see an oil cooler.

noticed no oil on the belts either unless its just burned off.

Any ideas what this would be?