JAMMIE DODGERS: BIG MISTAKE

My little boy had asked if we could make some jammie dodgers, so a couple of days ago we set to work. I used a recipe I found in Fay's Family Food but I must have made a big mistake somewhere along the line. The dough was ok to roll out but once baked in the oven they just fell apart!
They look quite tasty but I think I must have weighed out the sugar wrong as they aren't very sweet and the consistency is (very!) wrong.
Who knows what happened there: a combination of interruptions from a little one and baby brain I expect!
I will try again and vow to double check everything as it goes into the bowl.