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Rinse the potatoes and boil in their skins until just tender.
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Drain, then turn on to a clean tea towel to dry.
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When they're cool enough to handle, peel off their skins and slice thickly.
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To make the dressing: combine the oil and vinegar and season.
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Add the onion and chives.
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Gently stir the dressing into the potatoes and marinate for at least 1 hour.
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Blend the mayonnaise with the yoghurt and mustard.
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Add to the cold potato salad and carefully mix in, then turn into a serving bowl.
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This salad will keep for at least 24 hours in the refrigerator and even seems to improve in flavour.