Tigger commiserations (did I spell that right?). rats are awful creatures, but I would agreed with Alan on the frames, protect your crops if you cannot eradicate the pests.
Sue.........thanks for asking about the cold frame, talking about it helps with the paranoia.
What I have done is part bodge, part carpentry. I have a long raised bed which is about 7m long by 1.5m wide. It is fixed to the ground with hammered in stakes and basically I have added another 6inch board to the front. I have built up the back of the bed with a timber frame and recycled poly carb sheet.
For the roof / lid I have used corrugated plastic sheeting made into separate lids approx 1.5m square, framed with roofing battens, and hinged them to the high side with T hinges.
I was hoping to sew some early parsnips and carrots in it today, but did not manage it, so hope to do that next weekend, along with a few rocket spuds and peas, and lettuce, salad leaves etc.
Any other planting ideas for this bed would be welcome, unfortunately due to the construction work on the greenhouse etc, the sewing is a bit behind. is a pic of the greenhouse in it's new spot, reglazed in polycarb.
These two are of the new cold frame, still under ocnstruction.
Compo.
If I am not on the plot, I am not happy.........