  (Abridged) We present the results of fitting ASCA spectra of six narrow-line
Seyfert 1 (NLS1) galaxies with the ionised reflection models of Ross & Fabian
(1993). We find that five of the galaxies (TONS 180, PKS 0558-504, Ark 564, Mrk
335 and PG 1244+026) are well fit by the ionised disc model, and these are
often better fits than the alternative models considered. The sixth galaxy, NGC
4051, has additional spectral complexity that cannot be well described by a
simple ionised disc model or any of the other alternative models. All six of
the NLS1s we considered show evidence for a broad Fe Kalpha line, but none of
the line centroids are consistent with emission from highly ionised Fe. This is
most likely due to the line being redshifted because of relativistic effects.
We note that sources with larger ionisation parameters tend to have larger Fe
Kalpha EWs. We interpret this as evidence that ionised Fe features are making
their presence felt in the spectra. Since most of our sources have steep
spectra, highly ionised features are predicted even by the new variable density
reflection models. The one source we analyse with a photon index less than two
has the lowest ionisation parameter in our sample. We conclude that our result
is the strongest evidence yet that NLS1 might have ionised accretion discs.
This result gives further weight to the hypothesis that these objects contain
rapidly accreting black holes.
