How do you change Head gasket in Mini One?

To change the head gasket in a Mini One, first ensure you have the necessary tools and a replacement gasket. Begin by disconnecting the battery, draining the coolant, and removing components like the intake manifold, exhaust manifold, and timing belt to access the cylinder head. Carefully unbolt and lift the cylinder head off, clean the mating surfaces, then place the new head gasket and reassemble everything in reverse order, ensuring proper torque specifications for the bolts. Finally, refill the coolant, reconnect the battery, and start the engine to check for leaks.