According to the Sunday Times Rich List, published in April 2006, Irvine was the fifth richest person of Northern Ireland at that time, having increased his personal fortune to approximately £160 million.
De acordo coa Sunday Times Rich List, publicada en abril de 2006, Irvine era a quinta persoa máis rica de Irlanda do Norte nese momento, logo de aumentar a súa fortuna persoal a aproximadamente 160 millóns de libras.