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Boil potatoes in salted water for 10 mins until tender, adding the asparagus tips for the final 2 mins of cooking. Drain and allow to cool. Whisk together the salad dressing ingredients. then season to taste.
In a large bowl, toss together the potatoes, asparagus, salad leaves, herbs and radishes. Add two-thirds of the dressing, thoroughly mix through the salad, then spread the salad over a large platter. Break the hot-smoked salmon into large chunks, then scatter over the top along with the spring onions. Finish by pouring remaining dressing over the top.