The coal mines attracted glass manufacturer John Robert Lucas, who in 1788 established the Nailsea Glassworks that became the fourth-largest of its kind in the United Kingdom, mostly producing low-grade bottle glass.[11][12] The works closed down in 1873, but "Nailsea" glass (mostly made by glass workers at the end of their shift in Nailsea and at other glass works) is still sought after by collectors around the world.[13] The site of the glass works has been covered by a Tesco supermarket car park, leaving it relatively accessible for future archaeological digs.