The Iron Age in Britain is conventionally…
765 BCE to 622 BCE
The Atlantic system had by this time effectively collapsed, although England maintains contacts across the Channel with France, as the Hallstatt culture becomes widespread across the country.
The overall picture of continuity suggests this was not accompanied by any substantial movement of population; crucially, only a single Hallstatt burial is known from Britain, and even here the evidence is inconclusive.
On the whole burials largely disappear across England, the dead being disposed of in a way that is archaeologically invisible: excarnation is a widely cited possibility.