There is a bulletin board devoted to alternative histories, What If. It contains these threads on the consequences of Jacobite successes.

Bonnie Prince Charlie wins the 1745 Rising:
Part 1

http://groups.google.com/group/soc.h...4c2e962ec8e499

Part 2
http://groups.google.com/group/soc.h...05a2b70ecef1fa


Part 3
http://groups.google.com/group/soc.h...12f9ca257658dc

Charles III succeeds Anne http://groups.google.com/group/soc.h...dde0210e3ee031

If Charles I had fled to Virginia http://groups.google.com/group/soc.h...d6144cd7a3328d