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I don't think this POD has been used before, so here goes:
In OTL Lord Rothermere [http://en.wikipedia.org/wiki/Harold_Harmsworth,_1st_Viscount_Rothermere] was offered to become King of Hungary after an editorial he wrote in which he supported a detailed plan to restore to Hungary large pieces of territory it lost at the end of WW1. Now, it wasn't particularly serious, but it was an offer, all the same.
So, for whatever reason, the offer is serious and Rothermere accepts it. What would its effects be?