Mix yeast and starter in luke warm water
Leave to activate
Warm mixer bowl
Weigh flour and salt in mixer bowl
Stir in yeast mixture
Need in mixer on high speed until slapping sound
Cover and let prove 1 1/2 hrs ish
Tip out and portion into parchment lined baking tin
Let prove again
Heat oven to 250
Put in oven 20min
Turn down oven to 190 20min