Traditional GCSE grades of A*-G are to be scrapped and replaced with a numbered scale under the biggest reforms of the exams for decades.
An additional grade will be added into the current eigh-grade system, with pupils to be graded from one to nine - with nine the highest mark available, England's exams regulator Ofqual said.
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The letter calls for an end to harassment, abuse, and impunity in a world "ripe for change".
Police say that anyone who sees Whitehouse should not approach him, but instead call them on 999 and quote incident 23 of 18 February.