anthony trollope australian dollar bbc news bank of england british association for the advancement of science british rail computer currency decimalisation denarius department of trade and industry dublin euro french franc greater london council half crown introduction of the euro irish pound legal tender maundy money max bygraves metrication new zealand dollar palliser novels parliament of the united kingdom penny plantagenet palliser pound sterling public information film republic of ireland reserve currency royal commission royal mint shilling sixpence the scaffold threepence