All applicants are now routinely required to provide 10 digit fingerscans and a digital photograph when applying for a UK visa, with a few exceptions (Heads of State for example).

You have to provide biometric information at the Visa Application Centre (VAC) while submitting your application. A digital photograph will be taken and your fingers will be printed using a glass screen at the time of submitting the application. You should make sure that there is no henna on fingers, or any cuts or other markings on the fingertips before having the finger scans. You should also make sure that if there are any cuts and bruises on the face, they have healed or disappeared before you have the photograph taken. Digital photographs must be of full face and you should not wear sunglasses, a hat or any other head covering.