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Put the potatoes in a pan, season with salt and cover with cold water. Bring up to a boil and simmer for 15-20 mins, until they’re tender. Drain and leave to steam-dry in a colander for 5 mins. If the skins are papery and peeling away, you can rub them off, if you like.
Tip the potatoes into a bowl and add the vinegar, olive oil and some seasoning, toss well, then leave to cool.
Stir in the mayo, mustard, shallot, capers and herbs (saving a little to garnish). Check the seasoning and add a little more salt or vinegar, if you like. Scatter over the remaining herbs and serve.
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