We paid for Pimlico plummers roofing team to have a look at a sag in our roof. Although a surveyor had recommended reinforcing the roof, Pimlico said they wouldn't do the job without replacing the tiles with slates. Their quote was very expensive.
In the end, we went with a different roofer recommended by a friend. We got great quality service at a fraction of the cost, which leads me to the inevitable conclusion that Pimlico overcharge for their services.