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Hi Leon,
What Ian is alluding to is the system I use, both the Cheshire EP and a Laser collimator.
The Cheshire optimises the position of the secondary mirror, which the laser doesn't. The laser optimises the alignment of the mirrors, which the Cheshire might be a little soft on, and tricky to achieve without two pairs of hands.
I tried the Cheshire on its own- hard work, and best left to deal with the position of the secondary relatively to the focuser. Tried the laser on its own- no good as it can get the beam reflected back on itself without the secondary's position being optimal. Together they compliment each other brilliantly to get the most out of your Newtonian.
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