OK, for the quantities in Flatus' recipe and my recipe of about 1kg of dough I've been using a 30cm x 16cm oval banneton. I also have a 22cm round banneton.
Is the 22cm big enough for the Flatus recipe, so I can get a nice boule loaf?
Will a stainless steel mixing bowl inverted over the dough on a baking sheet work as a substitute cloche?