They fit perfectly. I could have used a 2.25mm needle and they would have been a little more snug.
Conclusions?? Well, three actually. Firstly, I can knit much faster on two circs. Secondly, the stitches don't fall off my needles anymore! And lastly, because I am so much more relaxed when I knit with two circs, I knit to gauge......so if I find an 8 stitch pattern repeat (as in casting on 64 sts), then I should knit with 2.25mm circs.
Here are my socks together with a delightful little semi-mini African violet:
