Flint weapons and tools having long since disappeared from the catalogue, flint became a building material.
Brick and flint houses can be seen all over south and east England and are still being built today.
These old cottages are in Norfolk on the same chalk belt as Thetford, above.
Many of these buildings will be in conservation areas so repairs and renovations will have to be made using original materials.
New houses tend to look a bit stark, but there's nothing that a couple of centuries of weathering won't put right.
Very much in FWIW territory, but when researching my family history I found one strand of my family had the surname Flint.
I traced them back into deepest Yorkshire in 1770.