Angelista, as long as you meet the spouse visa requirements you can go to Zim and get married and you will be back in no time.
I went to Zim back in March this year , got married and got my spouse visa within three days. I had overstayed for 6 years!
Had the help of the immigration advisory service to check all my docs and to write a letter of support before I went back.
For a list of supporting documents we sent with the application see link below.
It was a bit over the top but we did not want to take any chances. All the documents were put together neatly in a very thick folder by the time we were done!
http://www.immigrationboards.com/viewto ... ht=#242311