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We present parallaxes, proper motions, and $J$-band photometry for 348 L andT dwarfs measured using the wide-field near-infrared camera WFCAM on the UnitedKingdom Infrared Telescope. This is the largest single batch of infraredparallaxes for brown dwarfs to date. Our parallaxes have a median uncertaintyof 3.5 mas, similar to most previous ground-based infrared parallax surveys.Our target list was designed to complete a volume-limited parallax sample ofL0-T8 dwarfs out to 25 pc spanning declinations $-30^\circ$ to $+60^\circ$ (68%of the sky). We report the first parallaxes for 165 objects, and we improve onprevious measurements for another 53 objects. Our targets include 104 objects(mostly early-L dwarfs) having $Gaia$ DR2 parallax measurements, with which ourparallaxes are consistent. We include an extensive comparison of previousliterature parallaxes for L and T dwarfs with both our results and $Gaia$ DR2measurements, identifying systematic offsets for some previous surveys. Ourparallaxes confirm that 14 objects previously identified as wide common propermotion companions to main-sequence stars have distances consistent withcompanionship. We also report new $J_\mathrm{MKO}$ photometry for our targets,including the first measurements for 193 of our targets and improvements overpreviously published $J_\mathrm{MKO}$ photometry for another 60 targets.Altogether, our parallaxes will enable the first population studies using avolume-limited sample spanning spectral types L0-T8 defined entirely byparallaxes.

The Hawaii Infrared Parallax Program. IV. A Comprehensive Parallax Survey of L0-T8 dwarfs with UKIRT