Pancetta-wrapped fish with lemony potatoes

Name: Pancetta-wrapped fish with lemony potatoes
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Cuisine: Spanish, Greek, French, Italian, Mediterranean
Ingredients: 300g new potato; 100g green bean; small handful black kalamata olives; zest and juice 1 lemon; 2 tbsp olive oil; 2 chunky pollock fillets or another sustainable white fish; 4 slices pancetta or thinly sliced smoked streaky bacon; few tarragon sprigs, leaves picked