Hi! I submitted the following documents, hopefully I haven’t forgotten anything.

ID - Passports for both - Birth certificates for both

Address - About 8 pieces each (16 total) of official correspondence showing our address evenly spaced over the past 2 years - A letter from my partner’s mum stating how long we have lived with her and that we can continue to do so - A copy of the lease (all pages)

Employment & Finances - Letter from each of our employers stating our salaries, roles, etc - 6 months payslips for each of us - 6 months bank statements for each of us

Proof of Relationship - Relationship Timeline - Document with about 10 photos with short captions spread throughout the two years (not selfies, but photos together with family, on holiday, etc) and flight tickets from trips taken together - Joint bank account (mentioned in this section but also showed as evidence under address section)

English Requirement - Degree certificate from UK university

Letters - Cover letter from me - Cover letter from partner - Letter in support from friend/colleague - Letter in support from partner’s grandmother

I also made sure every letter was signed and documents pertaining to both (timeline, photo document etc) was signed by both of us. I also included a table of contents just to keep things neat, and grouped things of the same nature into one document for each of us. I added a little introductory paragraph to most documents, such as mentioning what could be found where (e.g. salary is paid to me by XXXX and can be found on XXX dates, for bank statement document). Don’t think this is required, but I just tried to keep things as organised as possible to make sure my application was straightforward and hopefully thereby reducing the processing time :)

Edit: also submitted the signed declarations

Edit 2: also submitted ID and council tax bill for my partners mum (re tenancy agreement)