My Mother-in-law used to live in a retirement sheltered housing complex, which we understood was once the location of a boys home in South Darenth. The entrance was more or less opposite when you reached the top of the hill from either New Road or East hill. It had its own small church, (original) which was still there, when I was last there. The nearest station is Farningham Road Station. The railway Line is very close. In Fact I belive the complex was later acquired by Union Railways, when it was thought the Channel Tunnel Railway line would use that section. The name of the complex is called Southdowns. I am not sure whether any original buildings remain, as most of the complex was purpose built about 25 years ago.
Hope this helps