And the search goes on...

I'm looking for a Autism Spectrum test which is reliable and realistic.

Here I've found a sight which allows CAST (Childhood Asperger Syndrome Test) to be downloaded free in, 17 different languages. I'm sure you have also spotted that this test is for Aspergers and not Autism, but look at the dates... pre the change to spectrum.

http://www.autismresearchcentre.com/arc_tests


J. Williams, F. Scott, C. Allison, P. Bolton, S. Baron- Cohen and C. Brayne, (2004)
The CAST (Childhood Asperger Syndrome Test) : test accuracy
Autism :45-68
F. Scott, S. Baron-Cohen, P. Bolton and C. Brayne, (2002)
The CAST (Childhood Asperger Syndrome Test) : Preliminary development of UK screen for mainstream primary-school children
Autism 6(1):9-31

I'm in the process of downloading the test and key. Look what crops up:

ARC Tests Downloads

Before downloading a test please indicate your acceptance of the terms and conditions for use of ARC publications by providing your details and ticking the box.
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Here we go into terms and conditions...

Tests developed at the Autism Research Centre (ARC) may only be used strictly for professional, scientific or clinical purposes, and are not for commercial use. Use of these Tests for commercial purposes may violate copyright legislation.
When using these Tests, full acknowledgement must be given to the ARC as the source of the material.

Once I have a good read, I will get back to you with which I think as an impartial is better.