Is THIS a warning? In the past few days I have begun to sense a dangerous and dark new intolerance in the air, which I have never experiences before. An unbidden instinct tells me to be careful what I say or write, in case it ends badly for me. How badly? That is the trouble. I am genuinely unsure. I have been to too many countries where free speech is dangerous. But I have always assumed that there was no real risk here. Now, several nasty trends have come together. The treatment of Jeremy Corbyn, both by politicians and many...