Trying, it's not that people here don't sympathize with you, but you have to understand that CIC really doesn't care that much about keeping spouses apart. They turn people down every day that have no criminal background and who have legitimate relationships without giving them much reason at all. They drag applications out over months and years with no regard to how it affects our lives.
You committed a serious crime and Canada will not admit you. That is their right as a nation. I know that everyone makes mistakes, but understand that you are still in a much much better place than most people. Your spouse can join you in the UK. Many people have to make the choice to leave minor children behind or to live in a third world country or other difficulties. You still have many more options than others who are trying to join their spouse in Canada.
The only way that an appeal can win is if you prove that they were wrong in rejecting your application. They say right off the bat that people with serious crimes aren't admitted unless they meet the requirements of rehabilitation, which you have yet to do. Therefore, they haven't done anything wrong and you wouldn't win the appeal.
Once in a blue moon someone might get a humanitarian/compassionate appeal, but since your spouse can easily join you in the UK, which isn't a bad place to live from what I've heard, it's highly highly doubtful.
