Applicable to those (main migrants and dependant(s), if any) applying for leave to remain (i.e.- initial or extension applications from within the UK) .Biometric residence permits - Tiers 1 and 5 of the points-based system wrote:From 14 December 2010, migrants must enrol their biometric information (fingerprints and facial photograph) with the UK Border Agency if they want to apply for further leave to remain in the UK under the Tier 1 or Tier 5 (Temporary worker) categories of the points-based system.
See also
Biometric residence permits - application process
Do I need a biometric residence permit?
regards