Dartford River Crossing Tolls

I congratulate my hon. Friend on securing the debate. Does he understand the frustration of my constituents that although Essex helped to pay for the original Dartford tunnel, which was constructed in the 1960s, out of local taxation, local residents are still paying bills? My correspondence with the Government has failed to explain why the charges are increasing, with even more profits flowing to the Government, even though the costs had been covered by April 2003, as he says. Can he explain that?