Russell, Mensa accepts results from IQ tests such as Cattell III B,
Cattell Culture Fair, Ravens Advanced Matrices, Ravens Standard
Matrices and Wechsler Scales. All of these are supervised and not
in the public domain, so you won't find them on line. You could try
here

http://www.mensa.org/index0.php?page=12

Note - the Mensa Workout is similar to what was used in the
past. For you in particular (as an educated English-speaking
person) it would present no comprehension problems. Nowadays
tests are mostly spatial problem solving, whch is culturally and
educationally fairer, as they involve no language, maths, or
general knowledge

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