A. overtake before the cyclist gets to the junction
B. flash your headlights at the cyclist
C. slow down and allow the cyclist to turn
D. overtake the cyclist on the left-hand side
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Give the cyclist time to make the manoeuvre by keeping well back. If it's windy be aware that the cyclist could wobble around in the lane, especially if they're coming out of a wind shadow of a large building where they would be susceptible to crosswinds.
Intimidating the cyclist by driving too close could make them nervous and more likely to veer into your path.