WI: Spencer Perceval was not assassinated

Today is the 200th anniversary of the assassination of Spencer Perceval. Here is a biography of him: http://www.oxforddnb.com/view/article/21916.

If Perceval had not been assassinated what changes, if any, would there have been in the policies of the British government? Also who would most likely have eventually succeeded him as prime minister?
 
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