They did a study and found that women who alternated lucozade with water were less likely to have ketones in their urine. Although who knows if this is a significant thing or a normal physiological thing for a labouring woman... but still, there you go!
I'm definitely going the Lucozade this time around - I have hypoglycaemia but never, ever feel like eating when I'm in labour. ANd then I get the shakes! So if I have lucozade, hopefully I'll avoid that.