In a pot of boiling, salted water, cook potatoes for 10 minutes, or until tender; drain. In a large bowl, add olive oil, Dijon mustard, mayonnaise, lemon juice, white wine vinegar, salt and black pepper; whisk until combined. Add potatoes, onion, celery, peas, chives and parsley. Cover with plastic wrap and refrigerate at least 2 hours before serving.