Your challenge is to make Sicily into a colony of the British Empire, until at least the 1950's. Bonus points if you can add any other Med. Islands to the Empire such as Crete or Sardinia...
how about Italy fights on the side of the Germans, as they historically were allied to do so, In the First World War,the Italians get beaten by the British in a naval war, and as part of the peace treaty, Sicily is given to the british as their crown colony on the meditteranean. It remains in British hands until the 1950's, when it is given back to the Italians, as a jesture of good will, much to the dislike of Winston Churchill.