Comparison of the spectroscopic and photometric redshifts in the CFHTLS D1 and D4 fields. All photometric redshifts are taken form our 8-band WIRDS photometric redshift catalogues. Spectroscopic redshifts are from the VVDS ultra-deep (23 < i < 24.75) sample for the D1 data (black squares) and the AAOmega spectra described in Sect. 2.2 (open blue circles) and 5 spectroscopic redshifts from Stanford et al. (2006) (filled red circles) for the D4 data.