I've been baking our own bread since the village bakery where we then lived closed down. I've worn out two Kenwood machines and am well on the way to wearing out my second Panasonic.
After a lot of experimenting we've settled on 1/3 Waitrose green flour and 2/3 Waitrose orange flour – I've no idea what's in them, I just go by the colour of the packet ! I recently experimented with Waitrose grey flour, which I know is rye. It rises but can't keep the bubbles (not enough gluten) so it sits down again. I was going to add PVA glue but was over-ruled, so I've given up the experiment.
I've found that a draught can affect the loaf – our breadmaker sits next to a window and I have to be sure to close up before baking on a cold or breezy day.
I use Allinsons tinned yeast – Easy Bake I think it's called. A tin lasts me about a month, and the yeast gets noticeably less active toward the end of the tin, which I counteract by gradually increasing the dose.
For water I use filtered tap water which I keep in a jug at room temperature. I don't think the temperature matters, but sometimes our tap water smells of chlorine and that may well upset the megobs.
George