The pictures couldn’t have contrasted more. On the one hand Conservatives young and old, smartly dressed, filed in to a packed venue in Manchester. On the other, a mob of spitting, bottle-throwing louts shouting “Tory scum!” One 18 year-old eruditely described on last night’s Question Time how she was called a “paedophile and child murderer” as she attempted to enter the conference. This is the last gasp of a political left that has truly and utterly taken leave of its senses.