  Left-right symmetric extensions of the Minimal Supersymmetric Standard Model
can explain neutrino data and have potentially interesting phenomenology beyond
that found in minimal SUSY seesaw models. Here we study a SUSY model in which
the left-right symmetry is broken by triplets at a high scale, but
significantly below the GUT scale. Sparticle spectra in this model differ from
the usual constrained MSSM expectations and these changes affect the relic
abundance of the lightest neutralino. We discuss changes for the standard stau
(and stop) co-annihilation, the Higgs funnel and the focus point regions. The
model has potentially large lepton flavour violation in both, left and right,
scalar leptons and thus allows, in principle, also for flavoured
co-annihilation. We also discuss lepton flavour signals due to violating decays
of the second lightest neutralino at the LHC, which can be as large as 20
fb$^{-1}$ at $\sqrt{s}=14$ TeV.
