OK - i've bitten the bullet and ordered the Clarivue privacy finish for the N900.

What I didn't do was read the comparison chart before I ordered it (yes, the muppet I am!): http://www.clarivue.com/comparison-chart.html

I have a feeling i'm not gonna be happy about the 'non-smooth finish and the fact it apparently leaves a residue... but hey! I could cancel my order, but it might turn out ok!

Anyway, its shipping to London so i'll report back here in hopefully less than their quoted max time of 20 business days...