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In a small bowl, mix together the relish ingredients and season with salt and pepper.
Slice the top 4cm off the loaf. Scoop out most of the inside, leaving 4cm at the bottom. Layer the ingredients inside the loaf, starting with the roasted peppers, then ½ the relish, the red onion, remaining relish, mozzarella, salami, pepperoni and rocket. Put the top of the loaf back on and wrap very tightly in plastic wrap.
Put the loaf on a tray and top it with another tray. Weigh it down with something heavy, such as a cast-iron frying pan.
To serve, unwrap and cut into thick slices.