  We consider top quark production and decay in the narrow width approximation
and study if the polarisation effects, that manifest themselves in correlations
of angular distributions of particles from top quark decays and final state
jets in the production sub-process, are affected by linear power corrections.
We find that, in general, the answer to this question is affirmative. We also
discuss how these non-perturbative corrections affect polarisation observables
used to study single top production at the LHC. Finally, we point out that
generic kinematic distributions of leptons from top quark decays are affected
by linear power corrections, which may have implications for proposals to
extract the top quark mass from such leptonic observables. On the other hand,
we demonstrate that the distribution of the ``out-of-collision-plane''
component of the positron momentum is free from linear power corrections,
making it an interesting candidate for the top quark mass measurement.
