I have just come back from holiday, and upon checking my o2 bill I notice that I have been charged £3 per MB for data roaming.

Am I not correct in thinking that the EU imposed a cap of €1 per MB as per this article?
http://news.bbc.co.uk/1/hi/world/europe/8010352.stm

If I have interpreted the article correctly, does that mean I would have a case against o2 to recover my additional costs?

cheers

Not sure about the article being correct, but i have not seen any phone company charge the 1 euro or below for data roaming, i can't see you recovering any cost back as this is all in the small print of any contract and on the website http://www.o2international.co.uk/sta..._and_data.aspx

I appreciate that the costs are states in their contract, I guess I am asking if perhaps the contract terms are actually in contravention to European law and in such a case therefore nullified by the law?

The €1 is the wholesale price (the price that providers can charge each other), not the retail price.