Well things were going well with the Nightingale Socks until I turned the heel - and then it didn't fit. Actually it had been a tight fit all along - even with adding stitches.
So - there was only one thing to do - start again using a bigger needle.
I kept the first one to compare - when I'm happy with the second I'll frog the first.
I think the second one will fit - if it doesn't I may have to surgically reshape my foot