This is the article I was referring to: /aanos.org/human-male-sexual-response-to-olfactory-stimuli/]https://aanos.org/human-male-sexual-response-to-olfactory-stimuli/
A combination of pumpkin pie and lavender had the strongest effect on penile blood flow (out of doughnuts, liquorice and cranberry). Vanilla, strawberry, cola, jasmine and oriental spice are also mentioned.
I'm struggling to think of something equally iconic as pumpkin pie in Britain - bakewell tart? I think it's basically a cake/baking scent that you're after, so for scented candles something like vanilla or cookie dough?
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