An Unmarried Partner Visa UK comes under the category of Family visas that extend to all couples who are unmarried, spouses, parents, children, or civil partners.

An Unmarried Partner Visa or Spouse Visa UK can let you stay in the UK, provided you and your partner have been living together for the past 2 years. Your partner must be:

• An Irish citizen
• A British citizen,
• Or someone who has settled in the UK with Indefinite Leave to Remain (ILR) or Settled Status.

Supporting Documents and Visa Requirements 

While applying for this Visa, you will be required to provide several key documents that make you eligible for it, such as:

• A valid passport.
• Evidence that you will have adequate accommodation in the United Kingdom.
• Copy of a certificate of the biometric residence permit (BRP) or of the current visa.
• Proof that you comply with the financial requirements. Examples may vary based on your different financial circumstances and may include, but aren't limited to, the following:
• Your and your partner's bank statements, including income and cash savings.
• Six months of payslips; longer may be required in the case of your employment being non-permanent.
• Reference letter from your employer, verifiable by supplying the above payslips about length of service, job title, and salary.
• Documents proving income, such as property rental or pensions.
• Past applications for immigration.
• National insurance number (if applicable).
• Any criminal convictions.
• Tuberculosis (TB) test results (if applicable). 

The Home Office also, therefore, expects to see significant evidence of regular contact, how joint responsibilities are being carried out, emotional support, ability to love and care for one another, interdependency, etc. Such evidence may include:

• The particulars of your partner- their name, nationality, passport, date of birth, and right of residence in the UK.
• Evidence of your genuine relationship with your unmarried partner, setting out when and how you met, how often you see one another, etc.
• Any evidence should be of recent origin that demonstrates the depth and duration of the relationship.
• Evidence covering how you have cohabited, eg, joint utility bills, leases, mortgages, or any joint services paid by you both.
• Evidence attesting to how you care for your partner.
• Information on all persons with whom your partner previously entered into a civil or formal marriage or had children, inclusive of divorce certificates.
• Information regarding individuals to whom your partner renders financial support. 
• All documents not originally in the English language must have a mandatory certified translation.

To be able to apply for this visa, you should fill in the online Unmarried Partner Visa UK application form. Gather all necessary documents and pay the application fees.

Conclusion 

An unmarried partner visa may be tricky to secure if you are not well aware of the requirements. Hiring an Immigration Lawyer in London will be highly beneficial