Navy blue UK passport with crest

I lost my navy blue UK passport yesterday around 5pm outside Reading railway station forecourt. The cover bears the UK crest and is a little creased at the bottom edge, with a small coffee stain near the lower-right corner. Inside it's in decent shape, but I can't travel without it, and I’ve got an important trip coming up in two weeks. It has sentimental value because it’s the document I use to work and study abroad, and losing it has me feeling anxious about the delays this could cause. If anyone found it, please help me get it back—it's really important to me.