Gerald Kaufman, the permanently controversial chairman of the Commons Culture, Media and Sport Select Committee, accused the station of "trivialisation". It is now a legal requirement for every vehicle, though Anderson was probably never paid for her invention.. It cut a slice and passed it on to a chute; a flap closed to catch the next slice, while the first continued on to the buttering device. A fine attempt to better a perfect and simple tool - the knife.

Mary Anderson's windscreen wiper It was while travelling on a New York tram on a snowy day in 1903 that Anderson had her revolutionary idea: "A simple mechanism... for removing snow, rain and sleet from the glass in front of the motorman." She devised a rubber-bladed squeegee on a spindle which went through a hole in the glass, attached to an inside handle. Marion Donovan's disposable nappy In 1950 Donovan, a 33-year-old mother from Indiana, created the first disposable diaper. Her first idea was a plastic "boater", a cover for cloth nappies, cut from a shower curtain Next came a nappy made from a disposable absorbent fabric.

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Manufacturers said it was too expensive to produce, so Donovan went into business herself She later sold her company for $1m Where there's muck, there's brass, as they say. Bertha Paatsch's bread-slicer Anyone who's been lumbered with making mountains of sandwiches will salute Ms Paatsch, a German housewife whose invention (patented in 1910) not only sliced but also buttered bread. Perryman's invention was a gas-powered lamp that produced more light without using more power, thanks to a curved reflector on top. Ruth Wakefield's chocolate chip cookie In 1930 Ruth Wakefield, landlady of the Toll House Inn, Massachusetts, accidentally invented America's favourite biscuit. Having run out of cooking-chocolate, she simply chopped up a Nestl?hocolate bar and put it in her cookie batter to flavour it.