Also youtube on Supatufa or just tufa...lots of instructive films with recipes.
He didn't use peat or perlite on the Gardeners' World clip, just cement, two types of sand and grit. All the recipies for hypertufa seem to contain peat or perlite. So will the 1:4 ratio suggested by Hogweed above be ok does anyone know?
I have found the recipe on the nursery's website at : http://www.slacktopnurseries.co.uk/index.php/news_single/bbc_gw_facts_figs
1 x cement, 2 x red sand, 2 x grit sand 1/2 x grit.
Yes it was on Beechgrove garden a few weeks ago.