UK passport, burgundy cover with crease

I lost my UK biometric passport yesterday around 3pm near the Guildhall on Winchester High Street in Hampshire. It's a standard burgundy passport with the Royal Coat of Arms, and there's a small crease along the bottom edge plus a tiny sticker on the inside cover from a charity run I did last month. It’s not just a travel document—it's tied to plans I had for travel soon, and I’m really worried about someone misusing it. If anyone found it, I’d be incredibly grateful to get it back; it has sentimental value and I’m hoping for a quick, honest return.