The correspondence file relating to the Powell portrait bust is held as part of the Thornhill Papers ( 2006 : 56 ) in the archive of the Henry Moore Foundation 's Henry Moore Institute in Leeds .
The terracotta remains in the collection of the artist .
The correspondence file relating to the Powell portrait bust is held as part of the Thornhill Papers ( 2006 : 56 ) in the archive of the Henry Moore Foundation 's Henry Moore Institute in Leeds and the terracotta remains in the collection of the artist .