In the UK, visit visas are valid for a maximum duration of six months and are intended for those who wish to visit the UK for the purposes of tourism, business trips, visiting friends and family, and to receive medical attention.
In General, You Must Show That
You are 18 or over;
You intend to visit the UK for no more than 6 months (or 12 months if you will be accompanying an academic visitor);
You intend to leave the UK at the end of your visit;
You have enough money to support and accommodate yourself without working or help from public funds, or you and any dependants will be supported and accommodated by relatives or friends;
You can meet the cost of the return or onward journey; and
You are not in transit to a country outside the ‘Common Travel Area’ (Ireland, the UK, the Isle of Man and the Channel Islands).
You Must Also Be Able To Show That, During Your Visit, You Do Not Intend To:
Take paid or unpaid employment, produce goods or provide services, including the selling of goods or services directly to members of the public;
You intend to visit the UK for no more than 6 months (or 12 months if you will be accompanying an academic visitor);
Do a course of study;
Marry or register a civil partnership, or give notice of marriage or civil partnership;
Carry out the activities of a business visitor, a sports visitor or an entertainer visitor; or