Apparently this is a coalhole Coal holes: These are covers from the period when the houses were heated with coal, into which the coal bags were poured, so that the coals did not have to enter the houses. These lids were used in the 19th and early 20th centuries.
Identical lid but without outer ring Photographed in 2022 by B.Chapman at 12 Wincott St, London SE11 4NT, United Kingdom Click for a larger image