Don't anyone ever say this blog isn't instructive.
Here are some pix of me and George's invention for tethering our two new coldrames to the hillside. Cunning, eh? If you too have the misfortune of gardening in an area of periodic cyclones, this could help you:
Wire, bungy ropes and a wooden length fixed to the ground the length of the frame - then just throw the ropes over the frame lids whether they're open or shut, fixing to the wires at either side.