Hanson Aggregates UK, a subsidiary of Hanson, itself a subsidiary of German aggregate leader HeidelbergCement, knows this well. As one of the UK's largest construction materials companies, Hanson Aggregates UK produces crushed rock, sand and gravel, dimension stone, ready-mix concrete, and mortar. The operating company's widespread UK facilities include more than 250 concrete plants, 100 quarries, 20 wharves, 10 recycling plants, and 10 distribution depots.