I picked this up this morning thinking it was a bedroll but now I am sure it is a tent side/door. It looks to be for the British Army made in 1962 by W.S. (P) ltd and has the number ADO 473.
At the top it has hooks, at the bottom it has a sod cloth and peg loops. Either side it has brass eyelets. The window seems to of been filled in and the curtain left in place which threw me to start with.
What type of camouflage is this though as it is not something I have seen before ?