"I am the head of Chemistry in a Scottish Secondary school. One of my senior pupils is investigating methods of determining copper and iron in 2p coins."
http://www.whatdotheyknow.com/request/copper_content_in_a_2p_coin#incoming-20865
The answer supplied ten days later was 7% Copper and 93% mild steel (with tolerances also disclosed).
This is a really good simple example of the benefit to the public from Freedom of Information laws in general and WhatDoTheyKnow.com in particular.
I have incorporated the Royal Mint's response into this Wikipedia article:
Two pence (British decimal coin)
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