Yale PBS Auto Deadlocking Rim Lock | Alexandra Locksmith
YALE PBS1 Front-Door Lock | NEXT DAY | DeskKeys.Biz
Yale P-BS1-DMG-PB-60, BS1 British Standard Nightlatch, 60 mm, Metallic Finish, High Security Approved by Insurance Companies, Dark Metallic Gray : Amazon.co.uk: DIY & Tools
YALE BS1 Cylinder Blank To Suit PBS1 & PBS2
Yale PBS1 & PBS2 Auto Deadlocking Nightlatch, Polished Chrome - L11726 from Door Handle Company
Yale PBS1 High Security Auto Deadlocking Nightlatch - British Standard 3621