  We describe a method from which cosmology may be constrained from the 2QZ
Survey. By comparing clustering properties parallel and perpendicular to the
line of sight and by modeling the effects of redshift space distortions, we are
able to study geometric distortions in the clustering pattern which occur if a
wrong cosmology is assumed when translating redshifts into comoving distances.
  Using mock 2QZ catalogues, drawn from the Hubble Volume simulation, we find,
that there is a degeneracy between the geometric and the redshift-space
distortions that makes it difficult to obtain an unambiguous estimate of
Omega_{m}(0) from the geometric tests alone. However, we demonstrate a new
method to determine the cosmology which works by combining the above geometric
test with a test based on the evolution of the QSO clustering amplitude. We
find that we are able to break the degeneracy and that independent constraints
to +-20% (1 sigma) accuracy on Omega_{m}(0) and +-10% (1 sigma) accuracy on
beta_{QSO}(z) should be possible in the full 2QZ survey.
  Finally we apply the method to the 10k catalogue of 2QZ QSOs. The smaller
number of QSOs and the current status of the Survey mean that a strong result
on cosmology is not possible but we do constrain beta_{QSO}(z) to 0.35+-0.2. By
combining this constraint with the further constraint available from the
amplitude of QSO clustering, we find tentative evidence favouring a model with
non-zero Omega_{Lambda}(0), although an Omega_{m}(0)=1 model provides only a
marginally less good fit. A model with Omega_{Lambda}(0)=1 is ruled out. The
results are in agreement with those found by Outram et al. using a similar
analysis in Fourier space. (Abridged)
