HI Pat,
Fiancee' Visa is a SIX MONTH Visa, and during that time, you are NOT allowed to work under any circumstances. If you have plans of working in your future husband's business and send money back home to your family if the time comes that you are now entitled to work doesn't matter anymore. Don't mention anything about work.

Belmontboy is right, don't mention anything about work in application form VF4

I have attended a seminar on British Council before i lodged my application for my visit visa. One speaker said the reasons why most applicants are refused:
1) For a visit visa even if they want to study on short term courses is not relevant, CEO concentrates on your answers based on a visit visa. One that is on a visit visa will have to go places and visit the beauty of the country and/or visit relatives or friends.
2) For a student visa even if they intend to work which is allowed, an applicant should concentrate more on questions abt students.
3) So for this particular question abt a fiance/fiancee visa even if there are plans of working in her future husband's business and will be sending money to her family back home is already irrelevant.

Best of luck.