Other competitors in the services sector include: Waste Connections (WCN), WCA Waste Corporation (WCAA), and Casella Waste Systems (CWST).

FORBES: Earnings Preview: Republic Services

The DWP said it wished to work with charities to "continually improve" the WCA for people with mental health problems.

BBC: woman with mental health problem

The charities involved in the case called on the government to suspend use of WCA tests for the people they help.

BBC: woman with mental health problem

The DWP said the tribunal had made clear that there are safeguards built in to the WCA process to help ESA claimants.

BBC: woman with mental health problem

The World Coal Association (WCA), a trade body for the industry, said that burning coal account for about 24% of global mercury emissions and the use of "adequate technologies" could reduce emissions of the metal from coal-fired power stations by up to 90%.

BBC: Nations agree on legally binding mercury rules