A bar, run by the Imperial College Student Union, open to the college's staff and postgraduate students and the staff of the Royal College of Music, the Royal College of Art and the South Kensington museums. The entrance is off the ground floor foyer of the Imperial College's Sherfield Building and leads into a modern spacious but low-ceilinged room, half of it divided off into a self-service cafe until 7pm. The decor and lighting create a relaxing atmosphere, evidently much appreciated by its users. One regular and one guest cask ale are normally available. The bar hosts infrequent cask ale festivals, perhaps just twice a year. "h-bar"? Well, perhaps because it used to be the Holland Club Bar, the name often shortened to the "H Bar", "h-bar" being the pronunciation of the symbol of the Reduced Planck's Constant, beloved of scientists!