Can't vouch for this, just first hit.. http://flocycling.blogspot.co.uk/2014/09/flo-cycling-tire-pressure.html
Thanks for that. Going by that chart I wasn't far off. But I found another online which took into account rider and bike total weight, weight ratio (front to rear wheel), and it was way different.
@dangeek started
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Can't vouch for this, just first hit..
http://flocycling.blogspot.co.uk/2014/09/flo-cycling-tire-pressure.html