Hi,
the glidersusa and the istf.hu sites are definitive pirate sites!!
The offered "free" models are unauthorized scanns from commercial sold models!
That´s the difference between plastic and paper, from a card-model you can get a copy much easier than from a Revell-Kit.
Please remove this links, to avoid some trouble to the owner of tis forum. I think the law in the UK isn´t there much different to the rest of europe.
Another point against downloading an printing pirate-models: if you look on the price for cardboard and ink for example to print a ten sheet model, you can get it mostly cheaper at ebay.(and witout getting in trouble with the law)
Best wishes from Germany
Ralf