Preheat the oven to 200C.
Combine the thyme, anchovies, oregano, chilli, oil, garlic and lemon zest in a bowl. Add the chicken and turn to coat. Add the potatoes and toss to combine. Place on a large baking tray and scatter over the speck.
Cut the zested lemon into wedges and add to the tray. Season and roast for 40 minutes or until chicken is golden and potatoes tender. Remove from the oven and top with tomatoes. Roast for a further 10-15 minutes until tomatoes are blistered.
Squeeze over roasted lemon juice to serve.