Gravity beat Rush and Philomena for the Bafta for outstanding British film.
The presence of the film - which stars US actors Sandra Bullock and George Clooney and was directed by a Mexican (Alfonso Cuaron) - in this category has caused controversy.
It was, however, filmed in Britain and the team responsible for its visual effects are UK-based.
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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.