  A few years ago, it had been shown that effects stemming from renormalisation
group running can be quite large in the scotogenic model, where neutrinos
obtain their mass only via a 1-loop diagram (or, more generally, in many models
in which the light neutrino mass is generated via quantum corrections at
loop-level). We present a new computation of the renormalisation group
equations (RGEs) for the scotogenic model, thereby updating previous results.
We discuss the matching in detail, in particular in what regards the different
mass spectra possible for the new particles involved. We furthermore develop
approximate analytical solutions to the RGEs for an extensive list of
illustrative cases, covering all general tendencies that can appear in the
model. Comparing them with fully numerical solutions, we give a comprehensive
discussion of the running in the scotogenic model. Our approach is mainly
top-down, but we also discuss an attempt to get information on the values of
the fundamental parameters when inputting the low-energy measured quantities in
a bottom-up manner. This work serves the basis for a full parameter scan of the
model, thereby relating its low- and high-energy phenomenology, to fully
exploit the available information.
