Actually, if you were to smell the Girling brake fluid, you would
distinctly smell the castor oil.

Years ago, when I serviced a large number of older European and British
cars, we had to keep Girling fluid in stock for the British iron.

You cannot mix the two due to differing compositions of the brake system
rubber parts between the European and British cars.

Put the wrong fluid in either system, and you were headed for trouble.