Apply Here : https://www.gov.uk/standard-visitor

General information about United Kingdom Visa

You can visit the UK as a Standard Visitor for tourism, business, study (courses up to 6 months) and other permitted activities. You can usually stay in the UK for up to 6 months. You might be able to apply to stay for longer in certain circumstances, for example to get medical treatment.

What you need to do

• Check if what you plan to do in the UK is allowed as a Standard Visitor.
• Check you meet the eligibility requirements.
• Check if you need to apply for a visa to visit the UK.
• Apply for a Standard Visitor visa online - if you need one.