Day 1 PM - Feed starter 4-12 hrs before using, so it is bubbly and doubled in size. To test if your starter is ready to use, place a spoonful into some water and if it floats, it's ready.
Day 2 AM - Place the starter in the water and mix until milky. Add the rest of the ingredients and mix into a shaggy dough.
Cover and leave for 30 mins to Autolyse
Stretch and fold - After 30 mins, wet hands and take hold of one side of the dough and stretch upwards before folding over onto the ball of dough. Turn the bowl a quarter turn and repeat until all 4 sides have been folded over. Cover and leave for 30 mins. Repeat 2 more times.
After 3 set of stretch and folds, cover and leave somewhere warm for a bulk ferment of 4-8hrs, until doubled in size.
Shaping - Once doubled, turn onto a well floured surface and gently stretch into a flat rectangle. Add the cheddar to the top and press in gently. Fold one end into the middle, then the other, forming a roll. Add any remaining cheddar to the top before you roll up. Take the end of the roll and roll that up, making a tight ball of dough. Roll the ball lightly forwards and backwards to create tension in the dough (see pics above)Place the dough face down into a lined bowl or banneton basket, cover and place in the fridge overnight (12-24 hrs) Day 3 AM - Place a Dutch oven into the oven and preheat to 250c
Take the dough from the fridge and place onto floured parchment paper or a bread sling
Using a sharp knife or lame, slash a deep cut in the bread to tell it where to expand, and score a pretty pattern lightly in the dough if desired.
Remove lid from Dutch oven (carefully!), and then use the parchment paper to lift and place dough into it, place on the lid and bake for 25 mins
After 25 mins, remove the lid, turn down the temp to 180c and bake for a further 20-25 mins, until golden brown.
Remove and cool, slice and enjoy!