Guinea pig with tan/white fur near Covered Market

I found a guinea pig this afternoon around 4:15pm wandering near the entrance to Oxford's Covered Market on Market Street. It's a small, healthy-looking animal with tan and white fur and a blue bell on a red collar, plus a distinctive white heart-shaped patch on its left shoulder. It seemed a bit skittish but quickly settled after a passerby offered a leafy snack. I’d love to reunite it with its owner—if this is yours, describe the collar and patch to help confirm.