Comparison of the photometric redshift estimates derived with the BPZ method of template-fitting against the spectroscopic redshift obtained from X-Shooter observations. As a consistency check, we also used two other photo-z codes, namely HyperZ (Bolzonella et al. 2000) and LePhare (Arnouts et al. 1999; Ilbert et al. 2006), the results of which are over-plotted. Note that they have been shifted horizontally by ± 0.03 to aid the visualisation. These two codes show similar results with slightly higher dispersion so they are not used in the rest of the paper.