Burgundy UK passport with crest, lost near Waverley Station

I lost my burgundy UK passport yesterday around 3pm. It's a standard passport, tucked inside a black leather passport holder; the holder slipped from my jacket pocket somewhere along Princes Street, near the Scott Monument by Waverley Station. The passport cover has a small crease on the lower-right corner and a faint coffee stain on the back. This is my travel document for an international trip next week, so I’m really worried and would be so grateful to get it back if anyone found it.