There are two recent notices to centres about the MEI specification on the OCR website:
One under March 2012 about re-certification (because more centres are certificating for AS in Year 12 due to funding rules they may not be aware of the advice to re-certificate), graphical calculators in FP3 (you need a calculator that does up to 5 by 5 matrices for Markov Chains) and LINGO.
Under April 2012 there is one about Investigation of Curves dropping out from FP2.
Please note - since this news item was published, some or all of the relevant files or pages have been removed or updated by the organisation in question. As such, the original material is no longer available.