One of London's less well-known museums, the Motor Museum also takes an unusual approach. Rather than the vintage vehicles which form the core of most collections, its attention is firmly on custom machines. Like the Sewing Machine Museum, it's one person's collection: the owner, Elo, worked in fashion before turning all his attention to his hundreds of cars.
There are some other vehicles, too - a small collection of tractors, including a customised one, and even a bicycle.
Two caveats - admission isn't cheap (although it costs much less when bought online); and the museum is actually in Hayes, Middlesex, around the corner from the station.