Place your potatoes in a pan of salted water and bring to the boil, turn down to a simmer and leave to cook until they are just tender. Drain the potatoes and leave them to cool completely.
In a frying pan, fry your bacon until crispy and then also leave to cool.
Once your potatoes are cold, peel away the skins and cut into cubes. Place them in a bowl with the mayonnaise, sour cream, bacon and spring onions. Fold everything together gently until well mixed and then season to taste. Serve and enjoy!