Where is the UKBA located in the UK?

Public enquiry offices: where you apply in person. all have biometric facilitites.
'Our public enquiry offices offer a premium same-day service for non-European nationals who are making straightforward applications to extend their stay or settle in the UK. There are seven offices around the UK. Please note that some offices cannot process some types of application.'

Croydon public enquiry office
Lunar House, 40 Wellesley Road, Croydon CR9 2BY
Asylum screening Unit
Biometric Enrolment Centre
London biometric enrolment centre
Address: Identity and Passport Service, Hannibal House, Elephant and Castle, London SE1 6TE
Birmingham Biometric Enrolment Centre
Identity and Passport Service, 6th Floor, Kensington House, Suffolk Street, Queensway, Birmingham, B1 1LN

Derby Biometric Enrolment Centre
2nd Floor, Stuart House, Green Lane, DE1 1RS

Brighton Biometric Enrolment Centre

Solihull Public Enquiry Office
Dominion Court, 41 Station Road, Solihull, Birmingham B91 3RT
Biometric Enrolment Centre

Sheffield
Vulcan House, Riverside entrance, 6 Millsands, Sheffield S3 8NU
Biometric Enrolment Centre

Liverpool
Reliance House, 20 Water Street, Liverpool L2 8XU
Biometric

Glasgow
Festival Court, 200 Brand Street, Govan, Glasgow G51 1DH
Biometric

Belfast
UK Border Agency Public Office, 1 Drumkeen Complex, Upper Galwally, Belfast BT8 6TB
Biometric

Cardiff
General buildings, Ground floor, 31-33 Newport Road, Cardiff, Wales CF24 0AB
Biometric