Preheat the oven to 220°C/gas mark 7.
Divide the slices of mozzarella between the two pizza bases. Top this with the Parma ham (you can lightly tear this to distribute it more evenly) and crumble over the feta.
Place in the oven and cook for 10-12 minutes or until the mozzarella is golden brown and melted. Divide the rocket between the pizzas and serve.