The following steps are what you will do every time you want to make a loaf.
Transfer the your 400g of starter to a larger bowl, and preferably allow to warm up to room temp or 27°C if you are using the quicker method - allow around 30 to 40 mins to get it to room temp or 27°C. This step isn't essential, but makes it easier to mix and get it more active. You can also add the water at the beginning of this process - that makes it even easier to mix when you add the flour.
Once it's warmed up, add in a your initial 530g of water and 530g of flour for your loaf. This works best if you pour the water in first and from a bit of a height, as it breaks up the starter dough and makes it much easier to mix. Or you can add it right at the beginning and mix up just before you add the flour.
Mix well to a rough wet dough - don't overmix it though as this will start to develop the gluten - do it just enough to completely mix the dough.
Remove 400g of the batter/wet dough at this point and cover and put back in the fridge. Make sure to put the reserved 400g of starter in a clean bowl and lid: kept in the fridge, it will keep generating batches of leavening for successive loaves but will never be used in its entirety. Removing it before the bulk fermentation increases the time it can remain dormant in the fridge - which is roughly 2 weeks maximum. You can leave it longer, but if you get a pink mould growing on it you will have to start again. If you want to keep it longer - you can freeze it, or you can feed it say 100g of water and 100g of flour and discard 200g - that will give you another 2 weeks at least.
Then cover the remainder of the dough, and leave for approximately 3 to 4 hours at a room temp of around 21°C (or rapid method 2 hours at 27°C). It's a good plan to allow the dough to cool down from 27°C to room temperature before beginning the kneading. In the bowl you will have a total of 1020g of very soft sticky batter/dough – which will be composed of the 530g of water and 530g of flour (called 100% hydration). During this waiting time it will expand to be roughly double in size and should ferment fairly vigorously with lots of bubbles visible from the side if the dough is in a glass bowl. Timing is a little tricky, but if you do this last thing at night and keep it in a lower temperature (around 7°C) it should be possible to do overnight - although I haven't tried that yet. I prefer using a temperature controlled proofing cabinet which gives better control of the timing. Actual amounts of mixture will be a little less as some dough gets left behind in the various bowls.
This is what it looks like, after the fermentation - when the bulk dough has roughly doubled in size.
This 1060g of dough, plus some extra flour, fat and salt will be used to make the loaf. For the best results add the remaining195g of extra flour FIRST to your bread machine pan. Then add the (almost) 1060g of dough/batter to your bread machine pan. Then 40g of margarine or olive oil, and 10g of salt – but no extra water (unless using the optional ground seed mixture). You will now have 730g of flour, 530g of water, the salt and the margarine/fat – enough to make one good sized loaf. You need slightly more flour because some gets left behind in the bowls. It will be a 73% hydration dough for the technically minded.
Set the bread-machine to the 45minute pizza or similar 45min dough only program, and the bread-maker will do all the hard work and transform it into a nice soft (but sticky) dough. Only allow the program to run for 10 minutes or so, because the fermentation does a lot of the kneading work for you. Overkneading leads to loss of elasticity and affects the rise and structure. If you don't have a breadmaker but have a stand mixer - use that with the dough hook.
During the pizza/dough program mixing, and also a little before you stop the dough program , open the lid to check all the flour is incorporated into the dough – it may need a bit of a helping hand with a plastic spatula to make sure it’s all incorporated in the dough. Sometimes the dough sticks to the bottom. Adding a few dustings of flour from a shaker (towards the end) helps stop this happening.
While the kneading is happening, grease the sides and bottom of a 2lb loaf tin. You can line the bottom with greaseproof paper - but with my well used tin that's not necessary. If you use a good quality non-stick pan, you will not have to line the bottom.
As soon as you stop the pizza dough program immediately remove the pan and tip into the waiting greased tin. If you let it stand, the dough will stick to the pan and be difficult to remove, so make sure to stop/turn if off and immediately tip the dough straight into the waiting greased bread tin. If you don’t time it right or do this, it can be difficult/messy getting all of the dough out of the bread maker pan as the dough is quite sticky due to the fermentation.
Use a spatula to get any last bits stuck to the paddle/sides out and spread out in the tin with a wooden or plastic spatula. You can sprinkle a little flour on top and pat/smooth it with your hands to help spread and gently push down into the corners of the tin or try using a couple of spatulas so you end up with a reasonably flat surface.
Leave to rise until the dough is at least double in size – so the edges are at but not above the top of your tin - usually between 2 ½ and 3 hours depending on how active your starter is and how warm the location. 25-26°C is a good compromise for the rising temperature - max 27°C or off flavours may predominate. A rule of thumb is at 21°C it will be 3 hours, at 27°C it will be 2 hours. It should have a nice dome above the sides of the tin - see picture.
It’s important not to let the dough rise for too long – you can estimate a doubling in size for the dough, or use the 2-finger method. Press the top with 2 fingers – if it springs back immediately, it’s still not fully risen – if the indentations linger and slowly come back – it’s ready to go in the oven. If the indentation remains – it’s probably over risen so give it less time in future.
Bake at 190°C fan oven on middle shelf for 42 minutes depending on how brown you like the crust to be. A way I've been experimenting with to get an even better rise is to put it in a pre-heated oven at 220°C for 15 minutes - then turn it down to 185°C for the remaining 27 minutes - 42 minutes in total.
Leave for a few minutes then turn out and leave to cool on a wire rack.
Then once it's cool, I put in a plastic bag and leave for a couple of hours. This softens the crust, and it can then be sliced and frozen. That way you never waste any bread. It works really well if you toast it from frozen.