'Among the wealthy elders, my views gave some offence. Two or three people walked out of my lecture in Hamburg. At a dinner in Oldenburg I was seated next to a senior academic who berated me for my leftist leanings - not what he expected of an Oxford professor...' John Carey, best known for his provocative stance on the arts and the academic establishment, looks back on his journey from an ordinary background to Oxford's oldest literary professorship...