This shot to show height of motte.I'm in shot.I'm 1.87m.tall. see http://www.ecastles.co.uk/philipdavis/English%20sites/3427.html Historical note:From the parish of the same name,ie GROTON,came John Winthrip,founder of the US state of Massechusetts. NB:Possibly an adulterine castle. see http://en.wikipedia.org/wiki/Groton_Suffolk see http://www.geograph.org.uk/photo/185891