  We present a catalogue of 618 high amplitude infrared variable stars (1 <
DeltaK < 5 mag) detected by the two widely separated epochs of 2.2 um data in
the UKIDSS Galactic plane survey, from searches covering 1470 deg^2. Most were
discovered by a search of all fields at 30 < l < 230 deg. Sources include new
dusty Mira variables, three new CV candidates, a blazar and a peculiar source
that may be an interacting binary system. However, c. 60 per cent are YSOs,
based on spatial association with star forming regions at distances ranging
from 300 pc to over 10 kpc. This confirms our initial result in Contreras Pena
et al.(Paper I) that YSOs dominate the high amplitude infrared variable sky in
the Galactic disc. It is also supported by recently published VVV results at
295 < l < 350 deg. The spectral energy distributions of the YSOs indicate class
I or flat spectrum systems in most cases, as in the VVV sample. A large number
of variable YSOs are associated with the Cygnus X complex and other groups are
associated with the North America/Pelican nebula, the Gemini OB1 molecular
cloud, the Rosette complex, the Cone nebula, the W51 star forming region and
the S86 and S236 HII regions. Most of the YSO variability is likely due to
variable/episodic accretion on timescales of years, albeit usually less extreme
than classical FUors and EXors. Luminosities at the 2010 WISE epoch range from
c. 0.1 Lsun to 10^3 Lsun but only rarely exceed 10^2.5 Lsun.
