Gray tabby cat, green collar, missing yesterday

I’m missing Milo, my gray tabby. He’s a medium-sized, short-haired cat with a white bib and a pink nose. He wears a bright green collar with a tiny silver bell, and there’s a notch in his left ear plus a white sock on his right hind paw—unique markers that help him stand out. We adopted him last year; he’s shy with strangers but incredibly affectionate once he trusts you. Yesterday around 5pm, he slipped out of the back door near the Bullring Shopping Centre on Corporation Street in Birmingham, West Midlands. This cat means a lot to me—he’s part of the family and has sentimental value. If you’ve seen him or picked him up, please reach out; I’d really appreciate getting him back home.