Lord Justice Leveson and Richard Madeley fight planning application for underground pool They are calling for the trust to explore the potential impact of the plans on underground water levels and how this may affect nearby houses. They said a similar basement excavation in the area had left one home in danger of collapse. Angus Walker, chairman of the trust, said he was unable to comment. "There are legal proceedings which will be heard in February and the trust has no comment in anticipation of those proceedings," he said. The application for the basement extension was originally made to Barnet Council on March 26 last year. It involves the creation of a basement beneath the back garden to hold a swimming pool and changing area, measuring over 15 yards long. The basement would stretch for a further 15 yards to accommodate a games room and wine cellar. Sir Victor's lawyers will try to persuade a High Court judge to pass a court injunction next month stopping the trust approving the radical blueprint until further notice. The trust has signed an agreement pledging that it will not make a decision before the High Court hearing. The body was set up in 1968 to preserve the character of Hampstead Garden Suburb.