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MrE
Emyr
Doh, looks like I got confused with the 5p & 10p, which used to be Cupro-nickel (75% Copper) until 2012.
50p still made of 75:25 cupro-nickel.
20p made of 84:16 cupro-nickel.
Graphs from here: http://www.infomine.com/ChartsAndData/ChartBuilder.aspx?z=f&gf=110563.USD.lb&dr=max&cd=1
Can't get much earlier than 2009 for Iron.