I think you've noticed by now that I'm a big fan of Rachel Allen's books. This recipe is from her as well.
A friend asked me the other day for a recipe with a high wholemeal content, and I wasn't sure my usual recipe would work with more than 50% wholemeal flour. So I had a look through my books and stumbled upon this recipe for a wholewheat loaf with oats and seeds, which is from Rachel's Favourite Food at Home.
A lot of wholewheat breads can be very dense and crumbly, but this one is surprisingly light. It is a bit crumbly, but that's probably partly due to the sunflower and other seeds, not just the flour type used.