Sorry about your wedding planner quitting!
The visa you need is FLR(M)... I would recommend applying using the paper form, NOT the online one:
https://www.gov.uk/government/publications/application-to-extend-stay-in-the-uk-as-a-partner-form-flrmAll the documents you need are listed on the application form, but it’s basically:
Finances - same as fiancé visa, but updated
Accommodation - same as fiancé visa, but updated
Relationship:
- marriage certificate
- 1 photo (unless applying in person)
- 6 official documents addressed to both of you at the same address, from at least 3 different sources, spread evenly over the time you’ve lived together in the U.K. (as you are here on a fiancé visa though, you may not have been able to gather this many yet)
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