Terminal 5 is sinking!!!

Heathrow's terminal 5 was built on top of a former sewage works on clay. Now the foundations are rising, and floor tiles are requiring repair along the terminal’s south side. The owners claim that it is normal to have a settling problem with clay, and there is no need for concern. However, Greenpeace wants to see additional reports on the problem before any work commences on the new terminal that is planned to be built just 500 meters from T5. What next for the poor beleaguered T5?