Mr Perring added: "The timbers were prepared using 'native' British woodworking techniques, unlike the Roman carpentry used everywhere else. Might this have been the work of forced labour? Several hundred late Iron Age or early Roman skulls, from a population that must have numbered in thousands, have been found in and around the Walbrook and were predominantly of young males. London's civic centre was ignored in the rebuilding, and no new temples or basilicas were erected. This suggests London lacked independent legal status and remained under direct military control.