Senior research economist at the Institute For Fiscal Studies, James Browne, has told ITV News that the Government's decision to reduce the top rate of income tax from 50p to 45p is a "big giveaway to a relatively small group of people at the very top".
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Some 66 people have been killed after the plane they were travelling on crashed in southern Iran.
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.