An exhibition of his work was held at Congress House in 2007 , and a book of his caricatures was published in April 2009 .
Gill was also known for his caricatures of fellow trade unionists , and often made on scraps of paper during meetings and conferences .
An exhibition of Gill 's work was held at Congress House in 2007 , and a book of his caricatures was published in April 2009 .
Gill was also known for his caricatures of fellow trade unionists , and often made on scraps of paper during meetings and conferences .