Malcolm Scott has established an excellent Facebook group which has a vast selection of images available. Look for Horton Kirby and South Darenth LHS on Facebook and read through the comments and images added, it is a fascinating site.
Another Facebook group worth joining is Swanley, Horton Kirby & Hextable Past and Present
English Heritage has a project Images of England which shows photos of listed buildings around the country, just search for Horton Kirby or South Darenth. If you click on the link to Historic England’s Archive, you will find a list of the images held for Horton Kirby and South Darenth, and some images are shown. Heritage Gateway gives information on listed buildings in the area.