The B252 was a short link road in Erith.
It started on the A220 Bexley Road, to the west of the town centre, and headed southeast along Queen's Road. It ended on the A206 less than half a mile later.
The road was upgraded to Class I status in the 1930s and is now part of the A206, which has been heavily upgraded in the years since. However, the number lived on, becoming the former route of the A206, with two spurs for the former A220 added in for good measure. By the 1960s, the northern part (former A206) had become unclassified, with the rest following since.
An image has been requested for this article.