The Star Analyser is a 100line/mm transmission grating, similar to Rainbow Optics one from the US. Baader had a 201lpm version, but not sure it's still available.
Paton-Hawksley also sell an "educational" range of gratings, 100/200/300 lpm at very reasonable prices. Great way to start spectroscopy.
VSpec and IRIS are very good freeware programs to capture and analyse spectra.
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