Let me guess, original MGs used Lucas electrical components. Yes, Lucas, the Prince of Darkness, the inventor of the short circuit, the first to offer three-way headlight switches, dim, flicker, and off, and so on ad infinitum.
Do you know why the British drink warm beer?
They have Lucas refrigerators.
....gad!! - are you ever on the mark...! bought a brand-new 1965 MGB right off the show room floor after I got off active duty with the Navy (had more money than I had sense, in retrospect...) what a bitch...! lights always burning out; two six-volt batteries behind the front seats; positive (!!) electrical ground; temperamental SU carbs, ...and on and on and on...could have had a new Ford Mustang for the price I paid for that “B”.....still miss it, though....my wife (of 53 years....) thought I was a real stud in that car....!!!
Lucas. Mastered the art of a simultaneous short and open circuit.