A further 12 archaeological test pits were excavated in June 2015, to follow on from the 2013 and 2014 excavations and brings the total excavated in the village to 35. In 2015, 47 Year 9 and Year 12 students from The Presdales School, the Sheredes School, The John Warner School and Samuel Ryder Academy all took part. The 2015 test pits were again sited through the core of the village, with a number in the northwestern half that had previously not been test pitted.
An additonal sherd of Late Iron Age pottery was also recorded in 2015 from GAM/15/4, just to the west of the cluster that had been found in previous years, although this site is still on the northerrn slope of the large hill that must have been occupied during the Late Iron Age. Activity was once again also seen to continue into the Romano-British period, but instead was found further to the west and south, although also likely still on the brow of the hill and suggests there was likely more in the way of activity in Great Amwell than previously suggested through the test pitting. High medieval pottery was then recorded from three test pits (GAM/15/1, GAM/15/2 and GAM/15/4) but only as single sherds and suggest that to the south of the current crossroads would have likely been open fields, away from the river side of the settlement. A shift to the outlying sites was noted during the later medieval however, and suggests that the settlement was affected by the socio-economic upheavals of the 14th century (including the Black Death), but was able to recover again during the post medieval as the settlement expanded along the construction of the New River. Activity continued to spread outwards from the core through the 19th century and later with all the modern 'infillling' of the settlement.