Brief note to self - don't bother making these again, there are better ways of using up a tub of buttermilk. I seem to be having a run of making things that just aren't quite to my taste at the moment. Hope I snap out of it soon, very frustrating!
The recipe came from 'Muffins - Fast and Fantastic'. It's the basic buttermilk muffin recipe with a tsp of morello cherry jam added before baking. There is nothing intrinsically wrong with the recipe, it just isn't to my taste. Not quite sweet enough I think, and when the muffins were baked there was a slightly odd (and offputting) appearance to the tops of them.
Eaten up happily at work, which goes to show that everyone's tastes differ.