ok here is my method so far
Get a big bowl
40z any strong bread flour
1/4 tsp dried yeast
water, enough to make a pancake like batter.
cover with clingfilm and leave for a day/overnight.
Next day put bowl back on scales and add
1 lb strong bread flour
1/4 tsp yeast
1 tsp salt
6oz water
mix it all together with a wooden spoon , cover with clingfilm and leave for a day/overnight.
It will have more than doubled have a flat top with bubbles.
knock back, turn onto an oiled board as it can be very sticky, flatten and pull out stretching the gluten threads and then fold in on itself, pick up and form into a ball pulling the dough tight on the top and folding in underneath.
Flour the board, and leave dough to rest for an hour.
Put a lidded casserole dish in hot oven at least 225 degreees, le creuset style is brilliant.
when hot hot hot,put dough gently into dish, slash top and put lid back on.
Bake for 30 mins, take off lid and bake till golden another 10/20 mins.
Longg slow rise makes the best taste and the double oven gets lots of really decent crust.
Best bit listening to the crust crackle as it cools down on a wire rack.