New UK Visa and Citizenship Application Service (UKVCAS) from 2nd November 2018 UK Government0
From 2 November 2018, the way you make an application for settlement, citizenship or to stay in the UK for study or work will change for some applicants.
New service: UKVCAS centres
Under the new service, you’ll make your application and pay your application fee online, this will also include your biometric enrolment fee (if applicable). You will also have to pay the immigration health surcharge (if applicable) online before you make your application and include your reference number on your online application.
You’ll then be directed to Sopra Steria’s website to book an appointment at a UKVCAS centre. At this stage, you can choose whether to purchase added-value services. These services will only be available to applicants using the UKVCAS service.
get full details at https://www.gov.uk/guidance/ukvis-new-front-end-services-what-you-need-to-know