Generally, with all applicants out there , this category does have a high number of refused (unsuccessful) visa applications because of the above reason - you have to qualify precisely for this category in order to be successful.
Unmarried Partner visa is not a substitute for a Spouse or a Fiancé(e) visa. It has 2 criteria on the relationship:
Firstly , it is a visa for those who have lived together in a relationship akin to marriage for at least 2 years. Not dated, not visited each other, but actually lived together for minimum of 2 years. We often see couples who have lived together for, say, one year and dated for a year before that. This is unlikely to work!
Secondly, the couple has to be able to prove the above with he specified documents. Again, we often see couples who did live together but didn't have documents to prove it , such as if they happened to live in a country with a "cash economy " (often the case in the Philippines or Russia etc). Often all the household documents bear one partner's name only or the couple lived with the foreign partner's parents.
Whereas this visa category sounds attractive, it is important to qualify for the requirements. We have been working with this category for over 10 years and through our experience and expertise we know what works and what doesn't.
We would be able to guide you through our advice session and then the application. If we don't believe you qualify for this visa, we will advise on the alternatives.