The replacement of steel by rough-cast concrete (béton brut) was a key element that seeded the Brutalist Movement. The Unité d'Habitation inspired many brutalist housing complexes. In England such buildings include the Alton West estate in Roehampton, London, and Park Hill in Sheffield, both of which have attracted much negative criticism. More successful English incarnations of the Unité d'Habitation include Chamberlin, Powell and Bon's Barbican Estate (completed 1982), Gordon Tait's Samuda Estate, Isle of Dogs (1965), Ernő Goldfinger's Balfron Tower (1967), and Trellick Tower (1972), all in London. The triple-level roof garden of Great Arthur House (1957) inspired by Le Corbusier's Unité d'Habitation is a fine vantage point towards St Paul's Cathedral and the Barbican Estate and has panoramic views across London. Roof terrace for the tenants was furnished with a decorative pool, seats and plant boxes. The crowning glory is a distinctive concrete canopy and pergola. The estate was popular with professionals such as doctors and is still a self-sufficient ‘urban village’. It is seen as the most successful of England's housing developments from the early 1950s. Designed by Chamberlin, Powell and Bon.