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I'm struggling a little because it's brand new and the forks are uncut, so I can't bond the sleeve and star nut in, so I can't compress the headset.
I make it 3.3mm and can't see there being over of 1mm of slack (I have got some weight on there, which has taken some of the slack up). The bearing seems quite proud though: I make it 1.7mm above the head tube.
Either way, I'll take a 45x3 please: still £10 posted?
The P3C hasn't arrived yet so I can't measure it, but I'm sure you know what's needed: do you have one in stock?