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As at October 2026, the latest opinion (of Andy Chapman) is as follows :- “While an Iron Age date cannot be totally excluded, the small size of the stone, c.300mm,  and the recovery of it from a stone wall, suggest that it is more likely to have been in use in the post-medieval period, 16th -18th centuries, and became disused and later abandoned when modern processing made such things redundant. The small diameter may indicate that it was the grinding stone from a pot quern, with a small grinding/upper stone rotating within a bowl-shaped lower stone. I will be sending you a copy of a short paper on Rotary Querns c.700-1700, which includes a section on post-medieval querns with an illustration of a pot quern. These could be used for grinding grain, but at this date they were most often used for grinding malted grain for brewing ale, or mustard grains. Through the medieval period brewing ale was the preserve of women, the alewives, but they had been largely driven out of the trade by 1600, as it came under the control of established Guilds. The production of bottles was growing through the 17th century and there is a reference in 1691 that bottled beer kept longer than beer in barrels. But industrial scale production of beer only began in the second half of the 18th century, with improved steam engines. So it is likely that the use of hand mills to produce ground malt for small-batch brewing at home would have been in decline through the 18th century. This might suggest that the quern was abandoned and ended up in a stone wall perhaps somewhere between c.1650-1800, as the availability of bottled beer increased and home production was abandoned. Of course, a similar argument would apply to either grinding grain or mustard, as the industrial revolution also made these more readily available to buy ready processed.”

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