  We have developed a method "photo-type" to identify and accurately classify L
and T dwarfs, onto the standard system, from photometry alone. We combine SDSS,
UKIDSS and WISE data and classify point sources by comparing the izYJHKW1W2
colours against template colours for quasars, stars, and brown dwarfs. In a
sample of $6.5\times10^6$ bright point sources, J$<$17.5, from 3150 deg$^2$, we
identify and type 898 L and T dwarfs, making this the largest homogeneously
selected sample of brown dwarfs to date. The sample includes 713 (125) new
(previously known) L dwarfs and 21 (39) T dwarfs. For the previously-known
sources, the scatter in the plot of photo-type vs spectral type indicates that
our photo-types are accurate to 1.5 (1.0) sub-types rms for L (T) dwarfs.
Peculiar objects and candidate unresolved binaries are identified.
