Navy satin evening gown with pearl buttons

I found this navy satin evening gown this afternoon around 4:15pm outside the Covent Garden Piazza, right by the Royal Opera House in London. It's a floor-length, fitted gown with a row of small pearl buttons down the back and a subtle train. The fabric is in great condition, just a faint lipstick stain on the inner lining and a tiny snag at the hem from the pavement. It looks like a UK size 8 based on the inner label. It feels like a special piece, and I really hope the owner sees this and can reclaim it.