If you are turning left, you indicate left. If you are pulling in from a slip road, you indicate right.
Q1. Where is the tipping point between them - how small does the angle between the roads have to be before it flips from being 'indicate left' to 'indicate right'?
Q2. Does it make a difference if the road you are turning onto is one-way (i.e. actual one-way road, or half a dual carriageway?).
Here's the diagram I did in Excel:
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