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And one last thing, as it is a personal preferences (and depend on your weight, heavier rider = higher pressure), it also based on what kind of riding you do.
Commuting, usually a little higher than usual, especially in London where you're likely to ride slower and thus more prone to getting caught hitting potholes, also slightly less squirmly at a lower speed.
Country riding, you can get away with an even lower pressure (I ran 40psi front, and 50psi rear with the 28mm) as you'll usually go faster and float over poor road surface easily.
And of course, the other outcome is how much you're carrying on the bike that may required a higher pressure.
https://www.youtube.com/watch?v=a01QQZyl-_I
Rode 20km on these tonight at 60psi and it felt nice and comfy...felt a bit weird when climbing out the saddle though...tyre pressures confuse me a little, is there a set rule to rider weight/tyre size and optimum pressure?