  Based on a new spectroscopic sample observed using the WHT, we examine the
kinematic properties of the various emission line regions in narrow line
Seyfert 1 galaxies (NLS1s) by modelling their profiles using multiple component
fits. We interpret these results by comparison with velocity components
observed for different lines species covered in the same spectrum, and
equivalent components measured in the spectra of some broad line Seyfert 1s and
a representative Seyfert 2 galaxy. We find that the fits to the Halpha and
Hbeta line profiles in NLS1s require an additional broad (~3000km/s) component
that might correspond to a suppressed broad line region with similar kinematics
to those of typical broad line Seyfert 1s. From the profiles of the forbidden
high ionisation lines (FHILs) in NLS1s, we find evidence that they appear to
trace an `intermediate' velocity region with kinematics between the standard
broad and narrow line regions. Weaker evidence of this region is also present
in the profiles of the permitted Balmer lines. Finally, we note that despite
having similar ionisation potentials, the relative intensities of the highly
ionised lines of [Fe X]6374 and [FeXI]7892 show considerable dispersion from
one galaxy to another. The interpretation of this requires further modelling,
but suggests the possibility of using the ratio as a diagnostic to constrain
the physical conditions of the FHIL emitting region and possibly the shape of
the spectral energy distribution in the vicinity of 200eV. This spectral region
is very difficult to observe directly due to photoelectric absorption both in
our Galaxy and intrinsic to the source.
