There may be many reasons individuals from various countries around the world come to visit the UK for –family visiting, sightseeing, visiting on business, to undertake a short course, attend important events, visit the UK as a representative of a company, research work, or to sit in tests/exams in the UK.
If you have been refused a visitor visa you can submit a new application straightaway, however it is important that you are able to challenge the refusal decision and also provide evidence to support your arguments. You cannot appeal against the decision of a visitor visa.
The Standard Visitor visa requirements:
-Visitors must be able to show that they are visiting the UK only for a short period and in any case for no longer than six months and will be leaving the UK at the end of the visit.
-Visitors must provide evidence that they have enough funds to maintain and accommodate themselves in the UK without recourse to public funds.