[LMH]

Looking around a little online, I found an MG Old English White from 1961 era is DuPont code 83445. I don't know that it's the same exact color though. Vintage is close though.
Dan Case pointed out to me that many cars were repainted before being sold to buyers to repair damage due to shipping or final assembly. If Mr Hancocks car is the original paint as it came from AC Cars, that MG color my guess is it probably pretty close.
Larry