Yesterday I visited the Daniel Hersheson salon on the 4th floor of Harvey Nichols, and honestly, it was one of the best and most satisfying hairdressing appointments OF MY LIFE. I went in with a technically dodgy haircut, and came out with an entirely re-booted barnet, all thanks to a pioneering ‘Hair filler’ treatment, followed by the most considered hair cut and finish I think I’ve ever experienced … Allow me to give you a little hair history: Guys, I’ve had a string of awful and unflattering haircuts, and have been left with what felt like virtually no hair what-so-ever; terrible layers (which I…