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With the imminent promise of constraints on the epoch of reionization fromobservations of microwave background anisotropies, the question of whether ornot the standard Cold Dark Matter (CDM) model permits early reionization hasbeen subjected to detailed investigation by various authors, with theconclusion that reionization may occur at quite high redshift. However, it iswidely accepted that this model is excluded, as when normalised to the COBEobservations it possesses excessive galaxy clustering on scales below tens ofmegaparsecs. We examine the trends of observations, first in a fairly modelindependent way, and second by considering variants on the standard CDM modelintroduced to resolve the observational conflicts. We conclude that the epochof reionization favoured by the observational data is typically considerablylater than the standard CDM model suggests, and amongst models which may fitthe observational data only the introduction of a cosmological constant leadsto a reionization redshift close to that of standard CDM.Comment: 8 pages uuencoded postscript (LaTeX file available from ARL), changes  include correction of the previously mishandled cosmological constant case  (leading also to slight changes in abstract and conclusions) plus an update  of the COBE normalisatio

Trends in large-scale structure observations and the likelihood of early reionization