Clean the potatoes, peel if necessary and cut into chunks about 2 inches in size
Put the potatoes in a medium size pan, cover with cold water and bring to the boil.
Once boiling, add a good pinch of salt and reduce the heat
Cook for around 15 minutes till the potatoes slide off the prongs of a fork easily.
Drain well and once cool enough to handle cut each chunk in half or quarter, so that you have bite sized pieces. Then dress with the olive oil and season with pepper and a little salt and leave to cool
Mix the mayonnaise and yoghurt together with the mustard. Stir through the potato mixture carefully
Stir through the herbs and transfer the mixture to a serving dish. Garnish with a few reserved sprigs of herbs.