Preheat oven to 200°C/ 400°F/ gas mark 6. Line a baking try with parchment paper.
Combine the flour, dry yeast, salt and sugar together in a bowl.
Add the water and oil and make the mixture into a dough.
Dust a little flour onto a clean surface and turn out your dough. Knead for about 10 minutes.
Return to the bowl and leave to rise for about an hour.
Turn out onto a clean floured surface and divide the mixture into 8 logs. Lay them out on the baking tray.
Leave to sit for about 15 minutes before placing in the oven for 15 – 20 minutes. Remove and leave to cool.
While the buns are cooling you can make the icing sugar. Combine the icing sugar, water and vanilla essence in a small bowl. You may need to use less or more water depending on the icing consistency you prefer.
Generously spread a layer of the icing over the buns. Leave to set before serving.