We've found the critical path on the preparations, and it's the carpet for the nursery! Everything hinges on this...

How does this work? The carpet goes into the nursery which means that the chest of drawers and other items of furniture for the nursery can move from the spare room into the nursery. This frees up access to the loft, which means the Christmas decorations can come downstairs. Then, the shelves and the cupboard in the study can come out and go into the spare room. Then the fitted cupboards can come up from the garage and into the study, being replaced in the garage with the shelves etc from the spare room. Finally, we can assemble the cot bed!

Phew!