Clean and boil the potatoes until done but firm, and let them cool.
After the potatoes are cool, cut them into halves, quarters or bitesize pieces.
In a separate bowl, mix most of the herbs, vinegar, mustard, caper, mayonnaise, creme fraiche, olive oil, the diced red onion, and the chopped spring onion. Taste as you go and add salt and pepper.
When well combined add the potatoes and top with the rest of the herbs.
Let the potato salad rest for 10 minutes before serving.