For a General Visitor visa:
You Must:
-18 yrs old or over
-Can be able to pay for your return or onward journey
#Time taken
-Apply for visa up to 3 months before your date of travel to the UK.
#Duration of your stay
-6 months with a General Visitor visa.
#Documents required
-A current passport or other valid travel identification
-2 passport size colour photographs
#During trip
-evidence that you can support yourself during your trip, eg bank statements or payslips for the last 6 months
Note : Tuberculosis (TB) test certificate (where applicable) if you’re staying longer than 6 months