You may be able to apply for UK Temporary-Charity Work Visa if you wish to do unpaid voluntary work in UK for a charity. Apart from the general requirement to apply for a UK Visa you must also have a certificate of sponsorship and enough money to support yourself in the UK. There are some fees you are required to cover including: Application fee, healthcare surcharge fee and other fees wherever applicable. You can stay up to 12 month or the time given in your certificate of sponsorship plus 14 days, whichever is shorter.