Yes, your UK visa can be cancelled if you are no longer in a relationship with a UK citizen, particularly if your visa was granted based on that relationship. Here are the relevant details:
Relationship Breakdown and Visa Cancellation.

Grounds for Cancellation:

Visa Type:

If your visa is based on your relationship with a UK citizen, such as a spouse or partner visa, the continuation of your permission to stay in the UK is contingent upon the continuation of the relationship.
Immigration Rules:

Under the UK Immigration Rules, specifically Part 9 (Grounds for Refusal and Cancellation), the Home Office can cancel your visa if the relationship that formed the basis for your visa ceases to exist.
Specific Situations:

1. Spouse or Partner Visa:

If you hold a spouse or partner visa, and your relationship with your UK citizen spouse or partner breaks down, you must inform the Home Office. They will then decide whether to cancel your visa.

2. Dependants:

If you are in the UK as a dependant of someone whose visa is based on their relationship with a UK citizen, your visa may also be affected if the primary visa holder’s relationship ends.

Process and Considerations:

Notification:

You (or your sponsor) are required to notify the Home Office of any changes in your relationship status. Failure to do so can have serious consequences, including future immigration applications.

1. Home Office Review

The Home Office will review your case and decide whether to curtail (shorten) your visa or cancel it outright.

2. Discretionary Grounds

In some cases, the Home Office may exercise discretion based on the circumstances, such as the presence of children, your length of residence in the UK, and any other compassionate factors.

Steps to Take If Your Relationship Ends:

1.Seek Legal Advice:

Consult with an immigration lawyer to understand your options and the best course of action.

2.Explore Alternative Visas:

Depending on your circumstances, you may be eligible to apply for a different type of visa, such as a work visa, student visa, or a visa based on private and family life.

3.Prepare Documentation:

Gather all necessary documentation that can support your case if you need to make a new application or appeal a cancellation decision.

4.Consider Human Rights Grounds

If applicable, you might be able to apply to stay in the UK based on your right to private and family life under Article 8 of the European Convention on Human Rights.

Yes, your UK visa can be cancelled if you are no longer in a relationship with a UK citizen, particularly if your visa was granted based on that relationship. It is crucial to act promptly, seek legal advice, and explore all possible options to remain in the UK if your relationship ends.