Singapore Airlines (SIA) doesn't appear to have a physical, walk-in office in Derby, UK instead, you should use their official UK contact channels for bookings or support, primarily their 24/7 helpline at +1-866-829-1086 or their website's help center for self-service or email contact. While some third-party sites mention an address in Derby, the official source points to phone and online support for UK customers. Jauntlet.comhttps://jauntlet.com/