With winter fast approaching, this would be a good time to start the footings or concrete base for your new self build conservatory. At the moment the ground is still workable whereas in a few weeks time you are going to need a digger to smash through the permafrost that was your back garden!
Even if you do not assemble the conservatory until it warms up a bit, once the footings and base are installed, you can just cover the top of the dwarf wall and ignore the freezing conditions until you are ready to proceed.