A magnetometry survey carried out in September 2009 by members of SyAS in a paddock referred to in the 18th and 19th centuries as Brickhill and Brick Kiln Field revealed strong, largely rectangular, anomalies. An initial test-pit down to the top of surviving archaeological layers suggested that the anomalies were due to areas much affected by heat. Later work in the following year suggested these were the remains of substantial rectangular brick clamps of probably medieval date.