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Heat oven to 200C/fan 180C/gas 6. Heat ½ tbsp oil in a large pan, then fry the leeks, stirring for 5 mins until starting to soften. Add the stock, then simmer for 5 mins.
Meanwhile, tip the flour into a bowl, make a well in the centre, then add the yogurt, remaining oil, thyme leaves and a little salt. Using a cutlery knife, mix to bring together to a soft dough. Divide into 4 and shape into rounds on a floured surface.
Stir the peas, ham and grated apple into the leeks, then divide between 4 individual pie dishes or one large dish. Top each with a round of dough, scatter with more thyme, then bake for 20 mins until golden.