Preheat the oven to 200C/180C fan/Gas 6. Bring a large saucepan of water to the boil and add the new potatoes. Boil for 5 minutes then drain and place on a large baking tray. Drizzle with the olive oil and transfer to the oven for 15 minutes.
Meanwhile cut the tenderloin into four pieces and season well. Wrap each piece in two slices of pancetta then add to the baking tay with the potatoes. Roast for a further 10 minutes. Cut the vine tomatoes into small sprigs then add to the baking tray with the rosemary for a final 5 minutes. Ensure that the meat is cooked through before serving.
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