Small PVC Greenhouse

Hi All.
I am a newbie to growing veg and I have just acquired an allotment of which I知 in the process of digging. When all is finished I plan to erect a shed to keep my tools etc. I also have a very cheap PVC covered greenhouse, the type for starting off seedlings in the garden. Can the greenhouse be used on the allotment for growing vegetables (I had planned to attach it to one side of the shed), or is just not practical? Unfortunately I do not have a big enough allotment for a shed and a 6 x 4 greenhouse.

See my post on the thread about Wilkinson models - I recommended a Norfolk and they do some small versions and a 4 x 4' budget model.  Because you can dig a good length of cover into the ground they are more securely anchored.  A search on Norfolk greenhouses will take you to their website.