We haven't received a solution for this problem yet - do let us know if you find anything out. Please don't worry that your solution is not "complete" - we'd like to hear about anything you have tried. Teachers - you might like to send in a summary of your children's work.
Here are a few of the possible solutions for a space in the top left hand corner.
Here are some answers when the space is near to the middle.
Here are some answers when the space is about half way down the left hand side.