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We present a determination of the strange quark mass for two flavours (nf=2)of light dynamical quarks using the axial Ward identity. The calculations areperformed on the lattice using O(a) improved Wilson fermions and include afully non-perturbative determination of the renormalisation constant. In thecontinuum limit we find in the MSbar scheme at 2GeV, ms = 111(6)(4)(6)MeV usingthe force scale r0 = 0.467fm, where the first error is statistical, the secondand third are systematic due to the fit and scale uncertainties respectively.Results are also presented for the light quark mass and the chiral condensate.The corresponding results are also given for r0=0.5fm.Comment: 39 pages, 13 figures, late

Estimating the unquenched strange quark mass from the lattice axial Ward identity