Cut the ciabatta in half and brush the cut sides with a little extra virgin olive oil. Heat a ridged grill pan or normal grill and toast the ciabatta until crisp and golden. Rub the peeled garlic clove over the cut sides of the bread, tear the bread into rough chunks and set aside.
In a small bowl whisk together 5 tablespoons extra virgin olive oil, the crushed garlic clove and the red wine vinegar. Season well with salt and freshly ground black pepper and add the freshly chopped flatleaf parsley.
In a large bowl, mix together the bread and baby capers, plum tomatoes, sliced onion, cucumber, sliced celery, basil leaves, and black olives, and toss with the dressing. Season to taste.