Cosmological Parameters: do we already know the final answer ?
  Some of the arguments which support the strong concensus for an $\Omega_o$ = 0.3, $\lambda_o$ = 0.7 model are reexamined. Corrections for Malmquist bias, local flow and metallicity suggest a revised value for $H_o$ of 63 $\pm$ 6 km/s/Mpc, improving the age problems for an $\Omega_o$ = 1 universe. The latest CMB results may require a high baryon density and hence new physics, for example a strong lepton asymmetry. Difficulties for the $\Omega_o$ = 1 model with cluster evolution, the baryon content of clusters, and the evidence from Type Ia supernovae favouring low $\Omega_o$, $\Lambda > 0$ models, are discussed critically. 
M.Rowan-Robinson (Imperial College)