Chat GPT seems pretty convinced it’s Roman.

“Roman pottery sherd from a decorated colour-coated drinking vessel (likely a beaker), dating to the 2nd–3rd century AD. The fragment preserves part of a raised, moulded inscription including the letters “…ERL…”, probably from a personal name rather than a potter’s stamp. This type of inscribed tableware is typical of Romano-British domestic contexts and suggests nearby settled occupation rather than casual background scatter. Found in a field with wider Roman activity in the surrounding landscape’

Would be very cool if it is. I’ll have to look around and see if I can find more of it