Heat the oven to 200C /180C fan/ gas 6, and dice all the veg to a similar size (~1.5 cm cubes). Put them all in a roasting tray (apart from the pickled peppers) and drizzle over the oil, and add the garlic, thyme, oregano, coriander, chili flakes, a pinch of salt and pepper and mix this to coat everything and roast for 40 mins (turning them over after 20 mins)