I suspect that if you want really dark hued flowers then part shade is the way to go. I will try Mercury R and Tetra next year in more shade and see what happens.
Since I bought my house two summers ago, I've occasionally noticed these flowers appearing in the corner of my patio. They've reappeared over the last few days which reminded me to track down an identification. Seems like it's a hardy cyclamen flowering earlier than usual.
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The colour hasn't been enhanced in any way.