After reading all of your comments with great interest we tried a few of the techniques you suggested. And the one that was the most effective? Bribery.
We told him that if he slept through the night we would buy him his very own radio alarm clock, just like his dadas. So he did. Easy, right?
The next morning we took him to the shops to choose his prize. Now upon his bedside table proudly sits a radio alarm clock with a SUPER bight screen (you know, where the numbers show up). Double Whammy- it acts as a little night light too. When we need to address the issue again, which could be anytime given that daylight savings has begun and the days are getting longer, we will set the alarm clock and tell him he can't get up until the music plays.
So far it has worked. It's been a little while now and each night we have only been roused from out sleep by one of our children rather than both. I've actually just reached the 'sleep' section in this amazing book (oh, how I wish I had read it sooner) and it sheds a new light on why we may have had sleep issues in the first place, but thats another post, right?!
Photo by ubertim
Now to convince the Lady Baby that sleeping through is a good idea.
I can't thank you enough for your suggestions and support on this issue. Nothing like mumma advice.