Lost dwarf hamster near Custard Factory, blue harness

I lost my white-and-fawn dwarf hamster yesterday around 3pm near the Custard Factory in Digbeth, Birmingham. His name is Niko, he’s tiny—about the size of a ping-pong ball—with soft fur and a bright blue harness with a tiny silver bell. He also has a small notch in his left ear, which is a unique feature. He's a rescue and means the world to me; I'm really worried and would be grateful if anyone who saw him nearby could message me.