These tended to be a bit of a rarity in 1952. I have seen some period adverts from 1952 and the radios on offer were absolutely massive!! and quite expensive, so I would say that is is probably unlikely that many Minor owners fitted them back then.
So, from an originality perspective I would say that it would be better to exclude the radio, unless it was crucial to the plot!
Of course, it would be better if you had some solid info from someone who was actually alive in 1952 and was old enough to remember things like car radios! unlike me
