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The Bristol Britannia is a Model 314, and has an accurate shape.
The decals of course should be red rather than blue.
The propellers are not original, but are more realistic: the original props that came with this toy model were red.
Some specialize in just Dinky Toys but I have a few. This is my favorite.

 

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Wing span 8 3/4"

Wing span of real plane 142 ft 3 in (1707 in)

1707 / 8.75 = 195

So plane is approximately 1:200.

There may be a real one on display at a British aeronautics museum in Duxford. Or, some might even still be extant in Cuba! The Cuban airline Aerocaribbean operated them into the 1990s.

 

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In fact I remember a scene with one landing in the 1966 Man from UNCLE movie when Napoleon & Ilya go to Greece.