Living the high life – management consultant Brad Johnson was working long hours, travelling all over the world, having the best time. Now he leaves his flat – in his words – under exceptional circumstances. “I get very tired, I have to plan when I’m going, and it takes quite a lot, actually, to get me out the house, so it has to be a great event, or something, for me to leave,” he said. Brad Johnson has progressive MS Eight years ago at just 30…