Many thanks gentlemen for the answers.
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It also with C3 provide a capacitive potential divider with C1 to bottom end couple the external aerial to the aerial tuning coils.
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Is C3 only required for AC set with a live chasis
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If we put a large capacitor 3300pF in series with the RF tank LC circuit, it has no effect on its tuning natural frequency because of its low impedance to RF signal
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The reason I asked because I don't always see C3 equivalence in some other superhet circuits.
I am reconstructing a battery superhet using Ekco U332's matched tracking components. I built a battery superhet from scratch using DIY RF coils and matched components based on the tracking calculator solutions. The DIY superhet battery set works but there are still some significant tracking errors.