Black acetate glasses with initials N.R.

I was out yesterday around 3pm near the Starbucks on High Street in Colchester, Essex when I must have set my glasses down and walked off without them. They are matte black acetate frames with a subtle cat-eye shape, roughly medium size, and the left temple has the initials 'N.R.' engraved inside. There's a small scratch on the upper rim and a brown faux-leather case with a tiny crease; the case was tucked in my bag, but I think it might have fallen out. These glasses are my daily pair and they have sentimental value since they were a gift from my grandmother. I’m really hoping someone picked them up and can help me get them back.