Yeast - goes out of date quite quickly once exposed to air, so you need to use a new packet every couple of months.
Flour - I only ever use breadmaking flour. If you have a Waitrose near by, their own brand Canadian breadflour is fab, as is Dove Farm Organic.
Also, if you are using flour from the same bag, sometimes there can be a dodgy crop which will give you naff loaves.
Water - if you are making the bread straight away, use tepid water. If the machine is on a timer, use cold water.
Is your breadmaker over a washing machine/dishwasher/tumble dryer? I found out that when the machine is disturbed by vibrations it doesn't rise properly.
If you like the sound of any of these I'll post the ingrediants:
5 seeded
honey & sunflower
ploghmans loaf (from memory has apple juice and branston in)
Spicy fruit loaf - sooooooooo nice
Raisin & hazelnut
Apricot & walnut
Cheese & Bacon
Pesto & Pine Nuts
Maple & Pecan
Banana & Muesli
Hope some of this is of interest xx