Mix together in a jug the yoghurt, water, olive oil and salt.
In a large mixing bowl, put the plain flour. Make a well in the centre.
Pour in half the wet ingredients and mix with a spoon.
Then add in the rest of the wet ingredients. Mix well, then start to knead with your hands. You want a soft dough that is not sticky. So add more water if your dough is too dry, or add more flour if the dough is too wet and sticky.
Cover the dough with a wet tea towel (or some cling film) and let it rest for about an hour.
You then need a clean flat surface - ideally a tray or a non-stick silicone mat. Place the dough on the surface and divide it into 8 pieces. Roll each piece into a ball.
Take little bit of olive oil in your fingers, and use your fingers to smooth the oil all over the dough ball. The oil will prevent your dough sticking to your work surface and your fingers!
Now, roll it out into a circle (or circle-ish shape - no perfectionists here!). It should be about 15cm in diameter, and around 3mm thick.
Heat up a frying pan as hot as it will go. No need to add oil, as you have already oiled the dough. Once the pan is hot, add the roti.
Cook the roti for about 1 minute. You should start to see bubbles form. As soon as they puff up, flip it over and let the other side cook for about 15-20 seconds. Do not let them burn. There should be a few darker spots (see photos!).
Repeat the process for each section of the dough.
Notes
The roti wraps will be good in the fridge for at least 4 days. Heat them up in the microwave or oven before eating (they go a little hard when stored but loosen up with the heat).