It's a dimmer switch made in China (Kaoyi) and sold in Germany (Konverter)
http://www.kaoyi.com/diyhp/jsp/sf_popup.jsp?img=/shopimages/30285/mmobj/attachment/987259252558678037.jpg
You may search for months to find a direct replacement - Maplins certainly wouldn't stock anything so esoteric.
In your situation I might be inclined to just throw the lamp away and buy a new one - or perhaps fit a standard 230/12V standard transformer without a built in dimmer. The wattage of the lamp will be significant.
The manufacturer will be pleased to sell you several hundred of them but a one-off is probably not a realistic proposition...
http://www.kaoyi.com/diyhp/30285/enus/c-43111/p-AAAV+EAAVAAAnVjAA5/FOOT_SLIDE_SERIES.html
Good luck...
Peccavi
November 2009