Flint knapping

Quoted text begins.My eyes have been opened today
End of quote.

Me too, George. Thanks to everybody for your replies:

Tomas, your information led me to Canterbury Crypt:
http://www.drttours.co.uk/Pages/Sections/cgallery.html;

George, I had never paid much attention to stone tools apart from what we
use, there are some stunning images here:
http://www.msu.edu/~doneycar/flint.html

John, your early attempt at flint walling echoed mine, using hornfels
(bluestone) after becoming accustomed to porous sandstone;

Deb, I had looked in vain for close-ups of flint walling.

Thanks again,
Simon