Posted: 05/02/2014 at 20:26
I think you sowed them at what is usually the right time but the seasons were all late year which probably didn't help. If the weather is normal (whatever that is - I've forgotten!) next spring, try again in early June, otherwise late June/early July. Lot's of carrot fly advice here:
From my own experience I think there's a lot more carrot fly about these days than there used to be so best of luck!