The original Glockenspiel – consisting of 27 bells, an astronomical clock and a procession of 23 farmers herding their cows to Alpine pasture – was given to the City of Westminster on its 400th anniversary in 1985 by Switzerland and Liechtenstein as a token of centuries of friendship. Redevelopment of the Swiss Centre from 2008 entailed its removal, but it was a condition of planning approval that the Glockenspiel should return to the square. Caldwell where lead engineer on the manufacture, installation and commissioning of the new Glockenspiel design by leading architects Jestico + Whiles and manufactured by Smyth of Derby, reopened on 21 Nov 2011.