Vintage Hasbro G1 Optimus Prime action figure

I lost my vintage Hasbro G1 Optimus Prime action figure yesterday around 3pm. It's about 12 inches tall, red and blue plastic with a chrome chest that's chipped in places, and the left antenna is bent. There’s a small sticker sheet on the back with faded Autobot insignias and a tiny dent on the right knee. I last had it near the North Entrance outside the Bluewater shopping centre in Greenhithe, Kent, by the Starbucks bus stop. It means a lot to me; my grandfather gave it to me years ago, and I’m really hoping to get it back.