Cut the crust off the ciabatta loaf. Tear the loaf into bite-sized pieces and place on to a baking tray. Drizzle with 3tbsp of oil and season with salt and black pepper. Toast in the oven for 4-5 mins until golden.
Halve and de-seed the peppers and place on to a baking tray and drizzle with the remaining oil. Roast in the oven for 20-25 mins. When cool enough to handle, place the roasted peppers into a plastic bag to cool. When the peppers have cooled enough the skin will be wrinkled and easily removed. Cut the skinless peppers into chunks.
Plunge the tomatoes into hot water, drain then plunge into cold water. Remove the skin.
Place the bread and peppers into a bowl; place a sieve on top of the bowl. Halve the tomatoes and spoon the juice and seeds into the sieve. Add the tomato flesh to the bread and peppers. Let the tomato juices drip onto the bread, peppers and tomatoes. When all the juices have dripped into the bowl discard the seeds and leave the salad for at least 30 mins. Tear a handful of basil leaves and add to the bowl. Toss and serve.