here some information about it....
enefits
The UK tourist visa lasts for up to two years if it is granted for multiple entries. A person can stay on a visitor visa for a maximum of six months except for medical visitors who can extend their leave to remain if required. As outlined above, the key benefit of a UK Business Visit Visa, or a visa for tourism is that the requirements on the part of the applicant are few. Unlike longer-term business visa, student visas or the Tier 1 visa, this short-term visa service allows its holder to enter the country freely and in the case of business people, to engage in a range of business activities without the more demanding requirements of other immigration services.
Public Funding
To be eligible for a UK visit visa you must be able to support and accommodate yourself without recourse to public funds. You must also intend to return home at the expiry of your UK travel visa. If a person has family settled in the UK an Entry Clearance Officer may question a person's intention to return home. For a UK visit visa to be granted it is important to note that it is not just your Immigration history that will be taken into account but that of your family.
Visit Visas for Medical Purposes
Medical Visitor visas are often issued to individuals who wish to attend the UK for medical treatment. In the past, the UK was a highly respected destination for medical Visitors. From IVF to plastic surgery it was accepted that the United Kingdom was a leader in these fields.
Today, fewer people attend the UK for medical treatment however, it is still important to note that a Medical Visitor visa can only be granted in certain cases. For a visa to be granted a person must not have a terminal illness and the treatment concerned must be private.
A medical visa is granted for six months at a time and is renewable for the duration of the treatment. Once again the grant can either be for a single entry, or for multiple entries for those people who wish to continue their treatment as an outpatient, only flying into the UK for appointments.