The excavation will descend over 50 feet below the surface say reports, deeper than the height of nearby houses, and will feature a 45-foot swimming pool, hot tub, sauna, massage room, ballroom, covered courtyards, staff accommodation, parking, a turning circle and car lift.
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The abuse began as the train approached Northwood. The woman carried harassing her victim until the next station.
London mayor Boris Johnson delegated the final decision to a deputy after publicly supporting the project.
A man who fired at officers from the National Crime Agency has been convicted at the Old Bailey.