This isn't about being in a conservation area but rather the road being unadopted and therefore not maintained by the council. Beckenham is full of them.
https://www.barkergotelee.co.uk/who-is-responsible-for-maint....
https://www.barkergotelee.co.uk/who-is-responsible-for-maint....
> Some 19th century street furniture also remains, enabling the road to present an excellent understanding of the appearance of many residential areas in the era of horse transport. The council will promote the retention of the original street surfacing and furniture in the conservation area.
Was something I normally expected in upmarket rural areas and traditional villages.