Maplins do a small "portable studio" light tent
<<<<LINK>>>> which they did have on offer at £9.99 although I see on thier website it is back up to £19.99. This would soften the shaddows considerably.
The picture on their website doesn't actually show the correct assembly - if you imagine rolling it forward through 90 degrees so that the peice of background material sticking out becomes the base, their base becomes the back and you then have white sides & TOP with the black case that is showing in their picture at the back folded back on itself at the back. Probably a bit difficult to visualise
- I'll post a picture of mine if I get chance when i get home tonight.