What are the least used London Underground stations?

How many "un-used" stations are there on the London Underground

• And I'm not referring to strikes, I mean the ones that are defunct/kaput/inoperative

• Answer:

  There are several dozen permanently closed London Underground stations across the London Underground ("tube") network. Some were simply built too near to other stations to be useful; others experienced too little use to make their retention worthwhile, or became redundant after lines were rerouted. Some of the closed stations retain their original station façades, while others have been demolished to make way for shops. At least one (Aldwych) is now used for filming and exhibition purposes. A number of other stations, Charing Cross for example, while still open, have closed platforms or sections. Permanently closed stations (42) Aldwych Aldgate Blake Hall Brill Metropolitan British Museum City Road Down Street Granborough Road Grove Road (Hammersmith) Hillingdon Hounslow Town King's Cross St. Pancras King William Street Lord's Mark Lane Marlborough Road Northfields & Little Ealing Osterley & Spring Grove Park Royal & Twyford Abbey Quainton Road . St Mary's (Whitechapel Road) Shoreditch South Acton South Harrow Swiss Cottage(Metropolitan Line) Uxbridge Uxbridge Road Verney Junction Waddesdon Waddesdon Road Westbourne Park Westcott Winslow Road Wood Lane (aka White City) Wood Siding Wotton York Road Full list of stations, lines they are on and reasons for closure: http://en.wikipedia.org/wiki/List_of_closed_London_Underground_stations