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Bojan/ Hamish,
I spent some time with Maurice when I stayed in Cobham. He used to visit me and I'd go over to his observatory (12" Meade).
We did discuss, among other things, various slit designs, including reflective needles.
The generally poor surface accuracy gives lots of Transversalium and the reflected beam spreads out over a wide arc - very inefficient. High speed rotation of the needle seemed to give slightly better results.
(See p142 "Astronomical Spectroscopy for Amateurs.)
I used a needle reflection to show the solar results which can be obtained with a grating and telelens.
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