Now that we have closed here is an archived post from the Ampthill Country Market stall blog...
Did you want to plant out a few vegetable plants in the garden and it is a bit early as the nights are a little cold, you can put a cloche over the top and they should be fine from April onwards - you may even be OK in March too.
We have lettuce plants for sale at the moment on Ampthill Country Market, you can put them in your garden with a little hat on now, and they will be fine. I would suggest that you make sure they don;t get too hot during the day. Leave the lids off as that will give them some air.
There are other plastic containers that will do the job just fine, just see what you are throwing away, just cut a hole for air circulation...and it didn't cost you a penny.
Just search for plastic bottle cloche - here is a little more reading
Plastic bottle cloche
25 ways to repurpose plastic bottles