OK, so the last couple of weeks have been a blip, and I've got back on track, with 1kg under last week's depressing reverse.
Over the months, I have lost:
Jan: 3.8kg
Feb: 2.6kg
Mar: 2.0kg
I suppose it's inevitable that, the less there is to lose, the less I will lose as I approach a sustainable weight, but I would be happy if April sees 2kg off, as that will reach my target.