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I also have the Millerspeed set-up. Alistair came over to my home, brought it with him, and we installed it here together.
If you watch the current Wheeler Dealers C2 episode on Velocity, you will see my car and engine at 45 sec into the show and you can see the set-up (for a moment).
BTW, Car Craft found ~10 hp using the Millerspeed set-up because of reduced friction and slightly different pulley ratios.