YJH colour–colour plot showing UKIDSS LAS photometry of candidate T dwarfs from DR5 to DR8. Confirmed T dwarfs are shown with blue filled circles, with arrows indicating limits on J − H colours for candidates from the YJ-only channel. Limits are for illustrative purposes, and are based on the canonical 5σ depth for the LAS of H = 18.8. Rejected candidates are shown with filled red squares, whilst yet-to-be followed-up targets are shown with black open circles. For reference, field stars from a rando‐mly selected 1 square degree region of LAS sky are shown as black dots.