‘None of you are Muslim, are ya?’ says the taxi driver coolly. It’s a remarkably, calmly delivered piece of xenophobia, proving that the sun even has a good effect on bigots. So though it may have made for a frosty entrance it provides a good talking point in the slow moving traffic as we make our way to the start of the flat-footed, full-blooded, bloated, banter-filled beginning of festival season proper. Because today is day one of Longitude 2016 a festival with a good reputation, an impressive line-up and the most important headliner of this year. So while sitting in…