c.1900 brass hanging lamp with four pendant glass shades by Harry Powell of Whitefriars. Standing 3ft 4in (1.02m) high, it is priced at £14,500.

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The selling show from May 13 to 27 coincides with the launch of the first book on this hitherto underrated innovator. W.A.S. Benson Arts & Crafts Luminary and Pioneer of Modern Design, edited by Dr Ian Hamerton, is published by The Antique Collectors Club at £45 and will be officially launched at the exhibition.

This is the first book launch for The Country Seat's Harvey Ferry and Willie Clegg who, for this show, combine again with the Scottish specialist dealer in lighting Scott Robertson.

The dealers first collaborated to mount the first ever commercial show on the subject, The Neglected Mr Benson, five years ago.

Today it is taken for granted that any roomset can be transformed by lighting.

But from the 1880s to 1920s, lighting was undergoing a series of radical changes, from candlelight to oil lamps, then gaslight and eventually the wonder of the electricity age.

At the forefront of design in these new mediums was William Arthur Smith Benson (1854-1924) who was trained as an architect but, in the 1880s, turned exclusively to designing and manufacturing all manner of lighting, from table lamps to hanging chandeliers. He was championed - and sold - by no less a personage than William Morris, the guru of Arts and Crafts, and he was also on sale at the fashionable Parisian gallery L'Art Nouveau.

During his lifetime, his designs appeared in museums in Norway and Germany as well the V&A, where a Benson electrolier still hangs in the boardroom.

Inventor as well as designer, Benson registered patents for many of his ideas, such as standard lamp adjusters, electric switches and roses for lamps, and even an early type of dimmer.

More than 50 different pieces of lighting equipment will be available at The Country Seat - with an extraordinary wide price range of £250 to £20,000 - alongside a sample of Benson's metalwork, which will include kettles, vacuum flasks, bowls and boxes.