I just finished installing ten gardens (each three metres long!) for Melissa and Warren at Washpool Farm Soaperie. They all have frames for cover such as frost, theres a surprise, bird netting and fruit fly mesh. Four are actual greenhouses.
I was very impressed with Melissa's products (and constant supply of coffee). So if you are down that way definitely worth a look. You can also check out her Facebook page and order online: you won't be disappointed.
I did have some help
Four Greenhouses to get a head start with planting