Oh, I am so cross with myself! I have screwed up one of the sleeves of DD's Granny-Go-Round jumper.
I knew I was playing yarn chicken on it, and worked out that I was absolutely down to the wire with the amount of yarn I have for 2 of the 4 colours. In an attempt to make it go a bit further, I decided to try and take the yarn inside the sleeves without tying off to avoid having multiple tails wasted, but it looked really messy so I decided not to continue. But instead of doing the obvious thing and just taking it back, I fastened off instead, and then I noticed a mistake in one of the rounds. If I take it back now, I definitely won't have enough as I can't reuse the yarn I have (I don't think - when I've accounted for what I lose when I rejoin, plus the tails, there wouldn't be enough anyway).
In the meantime, I've started the other sleeve while I wait for the extra yarn I ordered to arrive, hoping that the dyelots aren't too different given that the colours aren't right next to each other. If it's OK, I'll take it back and redo it - but I don't even have the band for one of them so I don't even know if I've ordered the right one. Aaaaaaargh!