This is not true across most of Iron Age Britain.

The soils of lowland England, in particular, are often acidic enough to dissolve bone within a few decades of burial, leaving no physical trace of the individual.

Sites that were occupied by large Iron Age communities, and that must have generated hundreds or thousands of burials over the course of their occupation, often show no skeletal evidence at all because the preservation conditions have eliminated the bone material.

This preservation bias is a fundamental challenge for Iron Age archaeology in Britain.